Rewards of Diversity

Whenever an opponent casts a multicolored spell, you gain 4 life.

Timely Ward

You may cast Timely Ward as though it had flash if it targets a commander.
Enchant creature
Enchanted creature has indestructible.

Gift of Immortality

Enchant creature
When enchanted creature dies, return that card to the battlefield under its owner's control. Return Gift of Immortality to the battlefield attached to that creature at the beginning of the next end step.

Invasion Plans

All creatures block each combat if able.
The attacking player chooses how each creature blocks each combat.

Spellshock

Whenever a player casts a spell, Spellshock deals 2 damage to that player.

Heat of Battle

Whenever a creature blocks, Heat of Battle deals 1 damage to that creature's controller.

Heat Stroke

At end of combat, destroy each creature that blocked or was blocked this turn.

Pyrostatic Pillar

Whenever a player casts a spell with mana value 3 or less, Pyrostatic Pillar deals 2 damage to that player.

Descent into Avernus

At the beginning of your upkeep, put two descent counters on Descent into Avernus. Then each player creates X Treasure tokens and Descent into Avernus deals X damage to each player, where X is the number of descent counters on Descent into Avernus.

Serenity

At the beginning of your upkeep, destroy all artifacts and enchantments. They can't be regenerated.

Repercussion

Whenever a creature is dealt damage, Repercussion deals that much damage to that creature's controller.

Genju of the Fields

Enchant Plains
{2}: Until end of turn, enchanted Plains becomes a 2/5 white Spirit creature with "Whenever this creature deals damage, its controller gains that much life." It's still a land.
When enchanted Plains is put into a graveyard, you may return Genju of the Fields from your graveyard to your hand.