Risky Move

At the beginning of each player's upkeep, that player gains control of this enchantment. When you gain control of this enchantment from another player, choose a creature you control and an opponent. Flip a coin. If you lose the flip, that opponent gains control of that creature.

From Magic: The Gathering.

Open the interactive version on https://mythscribe.cloud/app/tcg/cards/cms6o37rt14qdpb1hq3vt3v8x.