Mox Opal [Kaladesh Inventions] Naga Cleric Exile it at the beginning

Exile it at the beginning of the next end step

you may gain 3 life

Set: Eventide Type: Creature — Elemental Rarity: Rare Cost: {4}{B}{B}{B} Chroma — Umbra Stalker's power and toughness are each equal to the number of black mana symbols in the mana costs of cards in your graveyard

Its roar is the clatter of a thousand bones

put two +1/+1 counters on it for each Beast card you reveal in your hand

Mox Opal [Kaladesh Inventions] Naga Cleric Exile it at the beginningSet: Kaladesh Inventions Type: Legendary Artifact Rarity: Mythic Cost: {0} Metalcraft {T}: Add one mana of any color. Activate only if you control three or more artifacts. On loan from a private collection, this unique mechanism extracts power from a carefully prepared gemstone.