Hedron Detonator 
Creature — Goblin Artificer
Whenever an artifact you control enters, this creature deals 1 damage to target opponent.
, Sacrifice two artifacts: Exile the top card of your library. You may play that card this turn.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyLEGALvintageLEGALcommanderLEGAL