Melody, Wyvern Mythos

Flying, indestructible
When Melady enters the battlefield, put a shield
counter on another target creature you control.
Whenever you or a permanent you control loses
life or takes damage, prevent 1 of that damage.
Sacrifice Melady: until end of turn, you and
creatures you control gain hexproof and
indestructible, your life total cannot change, and
you cannot lose the game.