Gizmo

Whenever an opponent cast a (insert color) spell:
Blue - Create a 1/1 Black Gremlin creature token
Black - You gain 3 life
Red - You may pay {1} to tap target creature
Green - Put a +1/+1 counter on Gizmo
"No matter how much he cries, no matter how much
he begs, never feed him after midnight" - Chinese Boy, Gremlins (1984)