Aslyn, Moonlit Traveler

: Whenever a creature you control with lifelink does damage to a player, put a loyalty counter on Aslyn.
0: Until end of turn, Aslyn becomes a 3/6 Merfolk Cleric creature with lifelink, flying, and ward 3 that's still a planeswalker.
-9: Creatures you control gain indestructible, hexproof, and lifelink until end of turn.