Aki and Ruki, Twin Thieves

Double strike, spoils of war (Whenever a creature dealt damage by this creature this turn dies, you may search its controller's library for an artifact card and put it onto the battlefield under your control. If you do, that player shuffles his or her library.)
Whenever an artifact enters the battlefield under your control you may pay {1}{r}. If you do, put a token that's a copy of that artifact onto the battlefield.