Adriana's Valor

Hidden agenda (Start the game with this conspiracy face down in the command zone and secretly choose a card name. You may turn this conspiracy face up any time and reveal that name.) Whenever a creature you control with the chosen name attacks, you may pay {W}. If you do, that creature gains indestructible until end of

turn. (Damage and effects that say "destroy" don't destroy it.)

From Magic: The Gathering.

Open the interactive version on https://mythscribe.cloud/app/tcg/cards/cms6ogeymbsippb1hd8t0ga3v.