Ai Chiyu, Battle Healer

Lifelink, trample
Whenever a player casts a spell, you may put a
+1/+1 counter on Ai Chiyu.
{2}{r}{w}, {t}, Remove X +1/+1 counters from Ai
Chiyu: Any number of target creatures with total
toughness X or less gain indestructible until end
of turn. Ai Chiyu deals damage equal to the
excess toughness to target creature.