Aleatory

Cast this spell only during combat after blockers are declared. Flip a coin. If you win the flip, target creature gets +1/+1 until end of turn. Draw a card at the beginning of the next turn's upkeep.

From Magic: The Gathering.

Open the interactive version on https://mythscribe.cloud/app/tcg/cards/cms6oe14h9x6jpb1hygvgm3qh.