Necromancer's Covenant [Commander 2015] BRI021 Sacrifice another artifact or creature:

Sacrifice another artifact or creature: Put a +1/+1 counter on Dreadmobile

you may pay {R} and exile it with a time counter on it

the wurm engine kept operating long after its creators were gone

Set: Conspiracy: Take the Crown Type: Enchantment Rarity: Uncommon Cost: {1}{B} {2}: Put a plot counter on Deadly Designs

Necromancer's Covenant [Commander 2015] BRI021 Sacrifice another artifact or creature:Set: Commander 2015 Type: Enchantment Rarity: Rare Cost: {3}{W}{B}{B} When Necromancer's Covenant enters the battlefield, exile all creature cards from target player's graveyard, then create a 2 2 black Zombie creature token for each card exiled this way. Zombies you control have lifelink.