Leonardo, Big Brother (#14)

Type: Legendary Creature — Mutant Ninja Turtle

Text: Sneak {W} (You may cast this spell for {W} if you also return an unblocked attacker you control to hand during the declare blockers step. He enters tapped and attacking.)
Leonardo gets +1/+0 for each other creature you control.

Set: Teenage Mutant Ninja Turtles (#14)