Dawliig, Grasping Decay

Trample, Reach
Whenever Dawliig, Grasping Decay deals damage
to a creature, put a rot counter on that creature.
{t}, Pay {b}{b}{g}{g}: Destroy target creature with a rot counter on it, then put X -1/-1 counters on target creature, where X is equal to half the destroyed creature's toughness, rounded down. Create a 1/1 green Rot Ooze creature token with deathtouch.