Seaswooper Krasis

Flying
Hybridize {3}{u} ({3}{u}, Discard a creature card:
Put a +1/+1 counter on this creature. If it isn't a
Mutant, it becomes a Mutant in addition to its other
creature types.)
Whenever a +1/+1 counter is placed on
Seaswooper Krasis, tap target creature an
opponent controls. It doesn't untap for as long
as you control Seaswooper Krasis.