Aga-Dauh, Skull Inspector

Whenever Aga-Dauh enters the battlefield,
put a prey counter on up to 2 target creatures an opponent controls.
If Aga-Dauh's power is higher than a creature's toughness with a prey counter on it,
that creature's controller sacrifices it.
{1}{u}{b}: put a prey counter on target creature an opponent controls.
Whenever a creature with a prey counter on it
dies, put two +1/+1 counters on Aga-Dauh