Dominaria

Mishra's Self-Replicator | Artifact Creature | Assembly-Worker | Whenever you cast a historic spell, you may pay {1}. If you do, create a token that's a copy of Mishra's Self-Replicator. (Artifacts, legendaries, and Sagas are historic.) | Joseph Meehan

Traxos, Scourge of Kroog | Legendary Artifact Creature | Construct | Trample Traxos, Scourge of Kroog enters the battlefield tapped and doesn't untap during your untap step. Whenever you cast a historic spell, untap Traxos. (Artifacts, legendaries, and Sagas are historic.) | Lius Lasahido