Killer Croc, King of Mutants

Trample
Whenever one or more non-mutant creatures
die choose one - create a black and green 1/1
Crocodile Mutant creature token, or put a
+1/+1 counter on each mutant you control.
Sacrifice a creature: Target creature you control
becomes a mutant in addition to its other types.
"You either join us, or feed us."