Omarthis, Ghostfire Initiate [Commander Masters] Commander 2019 you may play one of

you may play one of those cards

In the arena

Untap them

Set: Commander 2016 Type: Instant Rarity: Common Cost: {1}{U} Counter target spell

sacrifice Contamination unless you sacrifice a creature

Omarthis, Ghostfire Initiate [Commander Masters] Commander 2019 you may play one ofSet: Commander Masters Type: Legendary Creature Spirit Naga Rarity: Mythic Cost: {X}{X} Omarthis, Ghostfire Initiate enters the battlefield with X +1 +1 counters on it. Whenever you put one or more +1 +1 counters on another colorless creature, you may put a +1 +1 counter on Omarthis. When Omarthis dies, manifest a number of cards from the top of your library equal to the number of counters on it.