Wire Surgeons — The Brothers' War Commander #57

Fear (This creature can't be blocked except by artifact creatures and/or black creatures.)

Each artifact creature card in your graveyard has encore. Its encore cost is equal to its mana cost. (Exile it and pay its mana cost: For each opponent, create a token copy that attacks that opponent this turn if able. They gain haste. Sacrifice them at the beginning of the next end step. Activate only as a sorcery.)