O Gosh it's Obosh!

Acidic Soil deals damage to each player equal to the number of lands they control.

Akoum Refuge enters the battlefield tapped.

When Akoum Refuge enters the battlefield, you gain 1 life.

{T}: Add {B} or {R}.

Choose target creature. Whenever that creature is dealt damage this turn, it deals that much damage to each other creature and each player.

As Ashling's Prerogative enters the battlefield, choose odd or even. (Zero is even.)

Each creature with mana value of the chosen quality has haste.

Each creature without mana value of the chosen quality enters the battlefield tapped.

Target player draws two cards and loses 2 life.

Bloodfell Caves enters the battlefield tapped.

When Bloodfell Caves enters the battlefield, you gain 1 life.

{T}: Add {B} or {R}.

Indestructible

Whenever Brash Taunter is dealt damage, it deals that much damage to target opponent.

{2}{R}, {T}: Brash Taunter fights another target creature.

Breath of Malfegor deals 5 damage to each opponent.

Any player may have Browbeat deal 5 damage to them. If no one does, target player draws three cards.

You may exile a red card from your hand rather than pay this spell's mana cost.

Cave-In deals 2 damage to each creature and each player.

Chaotic Backlash deals damage to target player equal to twice the number of white and/or blue permanents they control.

Cinder Barrens enters the battlefield tapped.

{T}: Add {B} or {R}.

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

Sacrifice Commander's Sphere: Draw a card.

{X}: Crypt Rats deals X damage to each creature and each player. Spend only black mana on X.

{T}: Add one mana of any color.

Crew 3 (Tap any number of creatures you control with total power 3 or more: This Vehicle becomes an artifact creature until end of turn.)

Menace, deathtouch

When Dire Fleet Ravager enters the battlefield, each player loses a third of their life, rounded up.

Enchant creature

Enchanted creature has lifelink and "Whenever a creature an opponent controls dies, put a +1/+1 counter on this creature." (Damage dealt by a creature with lifelink also causes its controller to gain that much life.)

Choose odd or even. Exile each creature with mana value of the chosen quality. (Zero is even.)

Flying, haste

Whenever Falkenrath Marauders deals combat damage to a player, put two +1/+1 counters on it.

Enchant creature

When Fatal Attraction enters the battlefield, it deals 2 damage to enchanted creature.

At the beginning of your upkeep, Fatal Attraction deals 4 damage to enchanted creature.

Until end of turn, target creature gains "When this creature dies, return it to the battlefield tapped under its owner's control with a +1/+1 counter on it."

Firemind Vessel enters the battlefield tapped.

{T}: Add two mana of different colors.

Flame Wave deals 4 damage to target player or planeswalker and each creature that player or that planeswalker's controller controls.

{T}: Add {R}. Put a stash counter on Glittering Stockpile.

{T}, Sacrifice Glittering Stockpile: Add X mana of any one color, where X is the number of stash counters on Glittering Stockpile.

Choose one —

• You draw two cards and you lose 2 life.

• Creatures your opponents control get -1/-1 until end of turn.

{T}: Add {C}{C}.

{2}, {T}, Sacrifice Hedron Archive: Draw two cards.

Inferno deals 6 damage to each creature and each player.

Enchant creature or planeswalker you control

When enchanted permanent dies or is put into exile, return that card to the battlefield under your control.

Trample

Frenzied Rampage — At the beginning of combat on your turn, choose an opponent at random. Knight Rampager attacks that player this combat if able.

When Knight Rampager dies, it deals 4 damage to target opponent chosen at random.

Spectacle {R} (You may cast this spell for its spectacle cost rather than its mana cost if an opponent lost life this turn.)

Exile the top two cards of your library. Until the end of your next turn, you may play those cards.

Haste; fear (This creature can't be blocked except by artifact creatures and/or black creatures.)

Whenever Lightning Reaver deals combat damage to a player, put a charge counter on it.

At the beginning of your end step, Lightning Reaver deals damage equal to the number of charge counters on it to each opponent.

When Magma Giant enters the battlefield, it deals 2 damage to each creature and each player.

{T}: Add {C}.

{1}, {T}, Sacrifice Mind Stone: Draw a card.

First strike (This creature deals combat damage before creatures without first strike.)

Whenever an opponent casts a white or blue instant or sorcery spell, Mindsparker deals 2 damage to that player.

({T}: Add {R}.)

Companion — Your starting deck contains only cards with odd mana values and land cards. (If this card is your chosen companion, you may put it into your hand from outside the game for {3} any time you could cast a sorcery.)

If a source you control with an odd mana value would deal damage to a permanent or player, it deals double that damage to that permanent or player instead.

Flying

{T}: Add one mana of any color.

As Outpost Siege enters the battlefield, choose Khans or Dragons.

• Khans — At the beginning of your upkeep, exile the top card of your library. Until end of turn, you may play that card.

• Dragons — Whenever a creature you control leaves the battlefield, Outpost Siege deals 1 damage to any target.

Target player draws two cards and loses 2 life.

You draw two cards, lose 2 life, then create a Blood token. (It's an artifact with "{1}, {T}, Discard a card, Sacrifice this artifact: Draw a card.")

{T}: Add {B} or {R}.

{B}{R}, {T}, Sacrifice Rakdos Cluestone: Draw a card.

Rakdos Guildgate enters the battlefield tapped.

{T}: Add {B} or {R}.

{T}: Add {B} or {R}.

{B}{R}: Rakdos Keyrune becomes a 3/1 black and red Devil artifact creature with first strike until end of turn.

{T}: Add {B} or {R}.

{B/R}{B/R}{B/R}{B/R}, {T}, Sacrifice Rakdos Locket: Draw two cards.

{1}, {T}: Add {B}{R}.

Scry 2, then draw two cards. You lose 2 life.

Target opponent may have Risk Factor deal 4 damage to them. If that player doesn't, you draw three cards.

Jump-start (You may cast this card from your graveyard by discarding a card in addition to paying its other costs. Then exile this card.)

First strike

Whenever another creature dies, you may put a +1/+1 counter on Rockslide Elemental.

Haste

Renown 1 (When this creature deals combat damage to a player, if it isn't renowned, put a +1/+1 counter on it and it becomes renowned.)

Whenever an opponent casts a noncreature spell, if Scab-Clan Berserker is renowned, Scab-Clan Berserker deals 2 damage to that player.

Choose a color. Searing Rays deals damage to each player equal to the number of creatures of that color that player controls.

When Serrated Scorpion dies, it deals 2 damage to each opponent and you gain 2 life.

Menace

At the beginning of your upkeep, reveal the top card of your library. Any opponent may have you put that card into your graveyard. If a player does, Sin Prodder deals damage to that player equal to that card's mana value. Otherwise, put that card into your hand.

Sorin's Vengeance deals 10 damage to target player or planeswalker and you gain 10 life.

Spike Cannibal enters the battlefield with a +1/+1 counter on it.

When Spike Cannibal enters the battlefield, move all +1/+1 counters from all creatures onto it.

Sliver creatures you control have "Whenever this creature is dealt damage, it deals that much damage to target player or planeswalker."

Steam Blast deals 2 damage to each creature and each player.

When Storm Caller enters the battlefield, it deals 2 damage to each opponent.

Indestructible

As Stuffy Doll enters the battlefield, choose a player.

Whenever Stuffy Doll is dealt damage, it deals that much damage to the chosen player.

{T}: Stuffy Doll deals 1 damage to itself.

At the beginning of each player's upkeep, Sulfuric Vortex deals 2 damage to that player.

If a player would gain life, that player gains no life instead.

Until end of turn, target creature gets +2/+0 and gains "When this creature dies, return it to the battlefield tapped under its owner's control."

({T}: Add {B}.)

Syphon Soul deals 2 damage to each other player. You gain life equal to the damage dealt this way.

Changeling (This card is every creature type.)

Whenever an opponent casts a spell, you may put a +1/+1 counter on Taurean Mauler.

Until end of turn, target creature gains "When this creature dies, return it to the battlefield tapped under its owner's control with a +1/+1 counter on it."

Destroy target creature. If you control an artifact, Unlicensed Disintegration deals 3 damage to that creature's controller.

Urborg Volcano enters the battlefield tapped.

{T}: Add {B} or {R}.

Kicker {8}{R} (You may pay an additional {8}{R} as you cast this spell.)

This spell can't be countered.

Urza's Rage deals 3 damage to any target. If this spell was kicked, instead it deals 10 damage to that permanent or player and the damage can't be prevented.

This spell can't be countered.

Volcanic Fallout deals 2 damage to each creature and each player.

Return target instant or sorcery card from your graveyard to your hand. Volcanic Vision deals damage equal to that card's mana value to each creature your opponents control. Exile Volcanic Vision.

Protection from red

Flying

Ward—Discard a card. (Whenever this creature becomes the target of a spell or ability an opponent controls, counter it unless that player discards a card.)

Whenever Westgate Regent deals combat damage to a player, put that many +1/+1 counters on it.