Making people hate you: 101

When Akki Blizzard-Herder dies, each player sacrifices a land.

Whenever a land enters the battlefield, Ankh of Mishra deals 2 damage to that land's controller.

Nonbasic lands are Mountains.

Whenever a creature dies, that creature's controller sacrifices a land.

{3}, Sacrifice Burnished Hart: Search your library for up to two basic land cards, put them onto the battlefield tapped, then shuffle your library.

Destroy X target artifacts.

The owner of target permanent shuffles it into their library, then reveals the top card of their library. If it's a permanent card, they put it onto the battlefield.

At the beginning of your upkeep, return an instant or sorcery card at random from your graveyard to your hand.

Whenever you cast an instant or sorcery spell, Charmbreaker Devils gets +4/+0 until end of turn.

Coldsteel Heart enters the battlefield tapped.

As Coldsteel Heart enters the battlefield, choose a color.

{T}: Add one mana of the chosen color.

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

Sacrifice Commander's Sphere: Draw a card.

You may play lands from your graveyard.

Indestructible

{T}: Add {C}.

Detritivore's power and toughness are each equal to the number of nonbasic land cards in your opponents' graveyards.

Suspend X—{X}{3}{R}. X can't be 0. (Rather than cast this card from your hand, you may pay {X}{3}{R} and exile it with X time counters on it. At the beginning of your upkeep, remove a time counter. When the last is removed, cast it without paying its mana cost. It has haste.)

Whenever a time counter is removed from Detritivore while it's exiled, destroy target nonbasic land.

Whenever a land is put into a graveyard from the battlefield, Dingus Egg deals 2 damage to that land's controller.

{2}{R}, {T}: Destroy target nonbasic land.

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

{T}: Destroy target land unless its controller has Dwarven Driller deal 2 damage to them.

{2}{R}, {T}: Destroy target nonbasic land.

Target player sacrifices a land.

Threshold — Each player sacrifices all lands they control instead if seven or more cards are in your graveyard.

Imprint — When Extraplanar Lens enters the battlefield, you may exile target land you control.

Whenever a land with the same name as the exiled card is tapped for mana, its controller adds one mana of any type that land produced.

{T}: Add {C}.

{2}, {T}, Sacrifice Field of Ruin: Destroy target nonbasic land an opponent controls. Each player searches their library for a basic land card, puts it onto the battlefield, then shuffles their library.

Fire Diamond enters the battlefield tapped.

{T}: Add {R}.

Whenever you cast a noncreature spell, Firebrand Archer deals 1 damage to each opponent.

If a source would deal damage to a permanent or player, it deals double that damage to that permanent or player instead.

{T}: Add {C}.

{T}, Sacrifice Ghost Quarter: Destroy target land. Its controller may search their library for a basic land card, put it onto the battlefield, then shuffle their library.

{T}: Add three mana of any one color.

Whenever an opponent activates an ability of an artifact, creature, or land on the battlefield, if it isn't a mana ability, Harsh Mentor deals 2 damage to that player.

{T}: Heartless Hidetsugu deals damage to each player equal to half that player's life total, rounded down.

Flying, trample

Whenever Hellkite Tyrant deals combat damage to a player, gain control of all artifacts that player controls.

At the beginning of your upkeep, if you control twenty or more artifacts, you win the game.

Destroy target artifact or land.

Recover {R}{R} (When a creature is put into your graveyard from the battlefield, you may pay {R}{R}. If you do, return this card from your graveyard to your hand. Otherwise, exile this card.)

At the beginning of your upkeep, if there are seven or more lands on the battlefield, sacrifice Impending Disaster and destroy all lands.

Untap all creatures and gain control of them until end of turn. They gain haste until end of turn.

Imprint — When Invader Parasite enters the battlefield, exile target land.

Whenever a land with the same name as the exiled card enters the battlefield under an opponent's control, Invader Parasite deals 2 damage to that player.

{T}: Add {R}.

When Keldon Firebombers enters the battlefield, each player sacrifices all lands they control except for three.

Haste

{T}: Create a token that's a copy of target nonlegendary creature you control, except it has haste. Sacrifice it at the beginning of the next end step.

[+1]: Untap target Mountain. It becomes a 4/4 red Elemental creature until end of turn. It's still a land.

[−2]: Add {R} for each Mountain you control.

[−5]: You get an emblem with "Mountains you control have '{T}: This land deals 1 damage to any target.'"

Equipped creature has haste and shroud. (It can't be the target of spells or abilities.)

Equip {0}

Whenever a player taps a land for mana, Manabarbs deals 1 damage to that player.

{T}: Add {C}.

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

{1}{R}, {T}: Put a mine counter on target land.

Whenever a land with a mine counter on it becomes tapped, destroy it.

When Mine Layer leaves the battlefield, remove all mine counters from all lands.

Destroy target land. If that land was nonbasic, Molten Rain deals 2 damage to the land's controller.

All permanents are artifacts in addition to their other types.

All cards that aren't on the battlefield, spells, and permanents are colorless.

Players may spend mana as though it were mana of any color.

Myriad Landscape enters the battlefield tapped.

{T}: Add {C}.

{2}, {T}, Sacrifice Myriad Landscape: Search your library for up to two basic land cards that share a land type, put them onto the battlefield tapped, then shuffle your library.

Afflict 3 (Whenever this creature becomes blocked, defending player loses 3 life.)

At the beginning of your postcombat main phase, add {R} for each 1 life your opponents have lost this turn.

This spell can't be countered.

Destroy all artifacts, creatures, and lands. They can't be regenerated.

Destroy target artifact or land. It can't be regenerated.

Price of Progress deals damage to each player equal to twice the number of nonbasic lands that player controls.

Each player discards their hand, then draws seven cards.

Miracle {1}{R} (You may cast this card for its miracle cost when you draw it if it's the first card you drew this turn.)

Copy target instant or sorcery spell. You may choose new targets for the copy.

Destroy target land, then Roiling Terrain deals damage to that land's controller equal to the number of land cards in that player's graveyard.

Red spells you cast cost {1} less to cast.

Destroy all nonbasic lands.

Seismic Strike deals damage to target creature equal to the number of Mountains you control.

Destroy all artifacts. They can't be regenerated.

({T}: Add {R}.)

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

When Solemn Simulacrum enters the battlefield, you may search your library for a basic land card, put that card onto the battlefield tapped, then shuffle your library.

When Solemn Simulacrum dies, you may draw a card.

Your opponents can't search libraries.

If an opponent would begin an extra turn, that player skips that turn instead.

{T}: Add {C}.

{T}, Sacrifice Strip Mine: Destroy target land.

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.

Equipped creature has hexproof and haste.

Equip {1}

Each player sacrifices X lands.

Whenever a land enters the battlefield, tap all lands its controller controls.

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

Each player sacrifices a land.

Valakut, the Molten Pinnacle enters the battlefield tapped.

Whenever a Mountain enters the battlefield under your control, if you control at least five other Mountains, you may have Valakut, the Molten Pinnacle deal 3 damage to any target.

{T}: Add {R}.

Destroy target artifact you don't control.

Overload {4}{R} (You may cast this spell for its overload cost. If you do, change its text by replacing all instances of "target" with "each.")

{1}{R}, {T}: Destroy target artifact. Viashino Heretic deals damage to that artifact's controller equal to the artifact's converted mana cost.

Destroy target land and all other lands with the same name as that land.

Whenever an opponent taps a land for mana, tap all lands that player controls.

If a creature an opponent controls attacks, all creatures that opponent controls attack if able.

Each player discards their hand, then draws seven cards.

Each player sacrifices four lands. Wildfire deals 4 damage to each creature.

Worn Powerstone enters the battlefield tapped.

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

Haste

When Zealous Conscripts enters the battlefield, gain control of target permanent until end of turn. Untap that permanent. It gains haste until end of turn.

Whenever a land enters the battlefield, Zo-Zu the Punisher deals 2 damage to that land's controller.