Donatello, Gadget Master [Teenage Mutant Ninja Turtles]

Cost: 2 U Sneak 1 U (You may cast this spell for 1 U if you also return an unblocked attacker you control to hand during the declare blockers step. He enters tapped and attacking.)
Whenever Donatello deals combat damage to a player, create a token that's a copy of target artifact you control.