Imaryll, Elfhame Elite [Game Night: Free-for-All]Set: Game Night: Free for All Type: Legendary Creature Elf Warrior Rarity: Mythic Cost: {2}{G}{G} Whenever Imaryll, Elfhame Elite attacks, it gets +X +X until end of turn, where X is the number of other Elves you control. You may have Imaryll assign its combat damage as though it weren't blocked. The elvish kingdoms of Llanowar are united in their distrust of outsiders.

quoting Confucius

Set: Commander Collection: Green Type: Creature — Spirit Rarity: Rare Cost: {3}{G}{G} Untap all permanents you control during each other player's untap step

or any set that uses the original Munchkin fantasy card backs

Whenever an opponent casts a spell

Set: Diamond & Pearl: Majestic Dawn Type: Fire Rarity: Holo Rare Retreat cost: Colorless

With variable scoring goals

Sacrifice Arid Mesa: Search your library for a Mountain or Plains card

Set: Beta Edition Type: Creature — Wolf Rarity: Rare Cost: {G} Banding (Any creatures with banding

Set: Sun & Moon: Team Up Type: Fire Rarity: Rare Retreat cost: Colorless

Set: Neo Genesis Unlimited Type: Psychic Rarity: Holo Rare Retreat cost: Colorless

(Auras with nothing to enchant remain in your graveyard

Set: Innistrad: Crimson Vow Prerelease Promos Type: Legendary Creature — Slug Horror Rarity: Mythic Cost: {5}{B}{B} At the beginning of each end step