Mechanical Griffin

Flying, trample
Metalcraft - As long as you control three or more artifacts, whenever a source an opponent controls deals damage to you, you may put that many +1/+1 counters on Mechanical Griffin and forge 1. (Create a colorless Sword Equipment artifact token with "Equipped creature gets +1/+0" and equip {1}.)
Upon learning the fate of the Retaliator Griffin, it was rebuilt even better than before.