Carcinisation

When Carcinisation enters the battlefield put a
+1/+1 counter on each crab creature you control.
At the beginning of each of your end steps put a
-1/-1 counter on each non-crab creature.
Whenever a creature dies from a -1/-1 counter
put on them from Carcinisation that creature's
controller creates a 1/1 blue crab creature token.