Urabrask, Darksteel Master

Eminence - At the beginning of your end step, if Urabrask, Darksteel Master is in your command
zone or on the battlefield, you may sacrifice a nontoken artifact. If an artifact isn't sacrificed this way, you get a poison counter.

Indestructible, First Strike, Haste

Artifacts you control have "When this leaves the battlefield, create a token copy of it, except it has indestructible."