Cerise, Slayer of Fear

First strike, lifelink At the beginning of your second main phase, if you gained life this turn, seek a card with the highest mana value among cards in your library with mana value less than or equal to the amount of life you gained this turn.

From Magic: The Gathering.

Open the interactive version on https://mythscribe.cloud/app/tcg/cards/cms6odbyl9cbppb1hz79hd1mz.