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

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

First strike

When Cemetery Gatekeeper enters the battlefield, exile a card from a graveyard.

Whenever a player plays a land or casts a spell, if it shares a card type with the exiled card, Cemetery Gatekeeper deals 2 damage to that player.

This spell can't be countered.

+2: Each opponent gets an emblem with "At the beginning of your upkeep, this emblem deals 1 damage to you."

-3: Chandra, Awakened Inferno deals 3 damage to each non-Elemental creature.

-X: Chandra, Awakened Inferno deals X damage to target creature or planeswalker. If a permanent dealt damage this way would die this turn, exile it instead.

When Court of Ire enters the battlefield, you become the monarch.

At the beginning of your upkeep, Court of Ire deals 2 damage to any target. If you're the monarch, it deals 7 damage instead.

{T}: Add {R}.

As Cursed Mirror enters the battlefield, you may have it become a copy of any creature on the battlefield until end of turn, except it has haste.

At the beginning of your end step, target enchantment deals damage equal to its mana value to its controller unless that player sacrifices it.

Whenever Ill-Tempered Loner is dealt damage, it deals that much damage to any target.

{1}{R}: Ill-Tempered Loner gets +2/+0 until end of turn.

Daybound (If a player casts no spells during their own turn, it becomes night next turn.)

Whenever a permanent you control is dealt damage, Howlpack Avenger deals that much damage to any target.

{1}{R}: Howlpack Avenger gets +2/+0 until end of turn.

Nightbound (If a player casts at least two spells during their own turn, it becomes day next turn.)

Enchant creature

At the beginning of your upkeep, you may put a fuse counter on Incendiary.

When enchanted creature dies, Incendiary deals X damage to any target, where X is the number of fuse counters on Incendiary.

At the beginning of your end step, target opponent gains control of Jinxed Choker and puts a charge counter on it.

At the beginning of your upkeep, Jinxed Choker deals damage to you equal to the number of charge counters on it.

{3}: Put a charge counter on Jinxed Choker or remove one from it.

{T}: Add {C}.

{T}: Target nonland permanent becomes an artifact in addition to its other types until end of turn.

Enchant player

Whenever enchanted player casts a noncreature spell, roll a d6. Maddening Hex deals damage to that player equal to the result. Then attach Maddening Hex to another one of your opponents chosen at random.

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

{1}{R}{R}: Put a blaze counter on target land without a blaze counter on it. For as long as that land has a blaze counter on it, it has "At the beginning of your upkeep, this land deals 1 damage to you." (The land continues to burn after Obsidian Fireheart has left the battlefield.)

At the beginning of the end step, if no creatures are on the battlefield, sacrifice Pyrohemia.

{R}: Pyrohemia deals 1 damage to each creature and each player.

Whenever a source you control deals damage to an opponent, you may put a quest counter on Quest for Pure Flame.

Remove four quest counters from Quest for Pure Flame and sacrifice it: If any source you control would deal damage to a permanent or player this turn, it deals double that damage to that permanent or player instead.

If a red source you control would deal damage to an opponent or a permanent an opponent controls, it deals that much damage plus 2 instead.

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

Each player secretly chooses a number 0 or greater, then all players reveal those numbers simultaneously and determine the highest and lowest numbers revealed this way. Wheel of Misfortune deals damage equal to the highest number to each player who chose that number. Each player who didn't choose the lowest number discards their hand, then draws seven cards.