Building a Wall

Defender

{2}: Amaranthine Wall gains indestructible until end of turn. (Damage and effects that say "destroy" don't destroy it.)

Defender (This creature can't attack.)

Flying

Flying, vigilance

Whenever a creature with defender enters the battlefield under your control, draw a card.

Each creature you control with defender assigns combat damage equal to its toughness rather than its power and can attack as though it didn't have defender.

Whenever a creature deals damage to you, put a gold counter on it.

Each creature with a gold counter on it is a Wall in addition to its other creature types and has defender. (Those creatures can't attack.)

When Aurification leaves the battlefield, remove all gold counters from all creatures.

Defender

Defender, indestructible

{10}: Monstrosity 10. (If this creature isn't monstrous, put ten +1/+1 counters on it and it becomes monstrous.)

As long as Colossus of Akros is monstrous, it has trample and can attack as though it didn't have defender.

{T}: Add one mana of any color in your commander's color identity.

Defender

Reach (This creature can block creatures with flying.)

Defender (This creature can't attack.)

{T}: Target creature gets +0/+4 until end of turn.

Defender

{1}{W}, {T}: Tap target creature.

Enchant creature

Enchanted creature has base power and toughness 0/4, has defender, loses all other abilities, and is a blue Wall in addition to its other colors and types.

Defender, flying

Prevent all combat damage that would be dealt to and dealt by Fog Bank.

({T}: Add {G}.)

Wall creatures you control get +1/+0 and have banding. (Any creatures with banding, and up to one without, can attack in a band. Bands are blocked as a group. If any creatures with banding you control are blocking or being blocked by a creature, you divide that creature's combat damage, not its controller, among any of the creatures it's being blocked by or is blocking.)

Defender

Glacial Fortress enters the battlefield tapped unless you control a Plains or an Island.

{T}: Add {W} or {U}.

Defender (This creature can't attack.)

Put X glyph counters on target creature that target Wall blocked this turn, where X is the power of that blocked creature. The creature gains "This creature doesn't untap during your untap step if it has a glyph counter on it" and "At the beginning of your upkeep, remove a glyph counter from this creature."

Choose target Wall creature. Whenever that creature is dealt damage by an attacking creature this turn, you gain that much life.

Enchant creature

Enchanted creature has defender.

Defender (This creature can't attack.)

When a creature attacks you or a planeswalker you control, if Guardian of the Ages has defender, it loses defender and gains trample.

Enchant land

Enchanted land is a 2/6 white Wall creature with defender. It's still a land.

When enchanted land dies, return that card to its owner's hand.

Defender (This creature can't attack.)

Hinterland Harbor enters the battlefield tapped unless you control a Forest or an Island.

{T}: Add {G} or {U}.

Defender, flying

Enchant creature

Enchanted creature gets +2/+5.

Cycling {3} ({3}, Discard this card: Draw a card.)

({T}: Add {U}.)

Flash (You may cast this spell any time you could cast an instant.)

Defender

When Jeskai Barricade enters the battlefield, you may return another target creature you control to its owner's hand.

Defender (This creature can't attack.)

When Jungle Barrier enters the battlefield, draw a card.

Defender

{T}: Put target card from a graveyard on the bottom of its owner's library.

Defender (This creature can't attack.)

{1}: Regenerate Living Wall.

Defender (This creature can't attack.)

{W}: Mirror Wall can attack this turn as though it didn't have defender.

Mistform Wall has defender as long as it's a Wall.

{1}: Mistform Wall becomes the creature type of your choice until end of turn.

Defender (This creature can't attack.)

{3}: Mobile Fort gets +3/-1 until end of turn and can attack this turn as though it didn't have defender. Activate only once each turn.

Defender (This creature can't attack.)

Exile a creature card from your graveyard: Put X +0/+1 counters on Necropolis, where X is the exiled card's mana value.

Flash (You may cast this spell any time you could cast an instant.)

Defender (This creature can't attack.)

When Nivix Barrier enters the battlefield, target attacking creature gets -4/-0 until end of turn.

Defender

{T}: Add {G} for each creature you control with defender.

({T}: Add {W}.)

As Primal Clay enters the battlefield, it becomes your choice of a 3/3 artifact creature, a 2/2 artifact creature with flying, or a 1/6 Wall artifact creature with defender in addition to its other types. (A creature with defender can't attack.)

Defender

Whenever Shield Sphere blocks, put a -0/-1 counter on it.

Defender (This creature can't attack.)

Shifting Wall enters the battlefield with X +1/+1 counters on it.

Defender (This creature can't attack.)

{1}: Snow Fortress gets +1/+0 until end of turn.

{1}: Snow Fortress gets +0/+1 until end of turn.

{3}: Snow Fortress deals 1 damage to target creature without flying that's attacking you.

Defender (This creature can't attack.)

Sunpetal Grove enters the battlefield tapped unless you control a Forest or a Plains.

{T}: Add {G} or {W}.

Defender (This creature can't attack.)

Green spells and blue spells you cast cost {1} less to cast.

Defender (This creature can't attack.)

Flying

Sunweb can't block creatures with power 2 or less.

Defender

{3}, {T}: Target creature can't be blocked this turn.

{X}: Testament of Faith becomes an X/X Wall creature with defender in addition to its other types until end of turn.

Defender (This creature can't attack.)

Flying

{U}: Thunder Wall gets +1/+1 until end of turn.

Create a 5/5 blue Wall creature token with defender. Sacrifice it at the beginning of the next end step.

As Unclaimed Territory enters the battlefield, choose a creature type.

{T}: Add {C}.

{T}: Add one mana of any color. Spend this mana only to cast a creature spell of the chosen type.

Enchant creature

Whenever enchanted creature blocks or becomes blocked by a non-Wall creature, destroy the other creature at end of combat.

Defender (This creature can't attack.)

{T}: Add {G}.

Defender

{3}: Walking Wall gets +3/-1 until end of turn and can attack this turn as though it didn't have defender. Activate only once each turn.

Defender, flying (This creature can't attack, and it can block creatures with flying.)

Defender

When Wall of Blossoms enters the battlefield, draw a card.

Defender (This creature can't attack.)

{G}: Regenerate Wall of Brambles.

Defender (This creature can't attack.)

Whenever Wall of Caltrops blocks a creature, if at least one other Wall creature is blocking that creature and no non-Wall creatures are blocking that creature, Wall of Caltrops gains banding until end of turn. (If any creatures with banding you control are blocking a creature, you divide that creature's combat damage, not its controller, among any of the creatures it's being blocked by.)

Defender (This creature can't attack.)

{3}: Turn Wall of Deceit face down.

Morph {U} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)

Defender, flying

Shroud (This creature can't be the target of spells or abilities.)

Defender (This creature can't attack.)

Whenever Wall of Essence is dealt combat damage, you gain that much life.

Defender (This creature can't attack.)

{W}: Wall of Faith gets +0/+1 until end of turn.

Defender

Whenever Wall of Frost blocks a creature, that creature doesn't untap during its controller's next untap step.

Defender (This creature can't attack.)

Wall of Glare can block any number of creatures.

Defender (This creature can't attack.)

Whenever Wall of Hope is dealt damage, you gain that much life.

Defender (This creature can't attack.)

Defender (This creature can't attack.)

When Wall of Junk blocks, return it to its owner's hand at end of combat. (Return it only if it's on the battlefield.)

Defender (This creature can't attack.)

{U}{U}, {T}: Create a 0/1 blue Plant Wall creature token with defender named Kelp.

Defender (This creature can't attack.)

Protection from black

Defender

Defender (This creature can't attack.)

{G}, Sacrifice a Wall: Draw a card.

Defender (This creature can't attack.)

At end of combat, exile all creatures blocked by Wall of Nets.

When Wall of Nets leaves the battlefield, return all cards exiled with Wall of Nets to the battlefield under their owners' control.

Defender

When Wall of Omens enters the battlefield, draw a card.

Defender (This creature can't attack.)

{G}: Regenerate Wall of Pine Needles.

Defender (This creature can't attack.)

Flying

At the beginning of each end step, if Wall of Resistance was dealt damage this turn, put a +0/+1 counter on it.

Defender, flying

At the beginning of your end step, you may gain life equal to the power of target creature you control.

Defender

Put a -0/-1 counter on Wall of Roots: Add {G}. Activate only once each turn.

Defender, flying

Cumulative upkeep—An opponent gains 1 life. (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)

Defender (This creature can't attack.)

Banding (If any creatures with banding you control are blocking a creature, you divide that creature's combat damage, not its controller, among any of the creatures it's being blocked by.)

Defender (This creature can't attack.)

First strike

Defender (This creature can't attack.)

Flying

Defender

{G}: Wall of Tanglecord gains reach until end of turn. (It can block creatures with flying.)

Defender (This creature can't attack.)

Whenever Wall of Tears blocks a creature, return that creature to its owner's hand at end of combat.

Defender (This creature can't attack.)

Prevent all damage that would be dealt to Wall of Vapor by creatures it's blocking.

Defender (This creature can't attack.)

Reach (This creature can block creatures with flying.)

Defender (This creature can't attack.)

{2}{U}{U}: Wall of Wonder gets +4/-4 until end of turn and can attack this turn as though it didn't have defender.

Defender; reach (This creature can block creatures with flying.)

You may choose not to untap Whip Vine during your untap step.

{T}: Tap target creature with flying blocked by Whip Vine. That creature doesn't untap during its controller's untap step for as long as Whip Vine remains tapped.