Kwarfa, Bellrepairman

Kidding (Whenever this creature attacks and is blocked, you may untap it and remove it from combat.)
Whenever Kwarfa becomes blocked, you may return target artifact card with converted mana cost 3 or less from your graveyard to your hand.
Whenever Kwarfa attacks and isn't blocked, you may return target artifact with converted mana cost 3 or less from defending player's graveyard to the battlefield under your control.