Oona, Queen of the Fae [From the Vault: Legends] Ox this unique mechanism extracts power

this unique mechanism extracts power from a carefully prepared gemstone

if another creature is on the battlefield

You may cast spells with the same name as that spell from among the revealed cards without paying their mana costs

Set: Eternal Masters Type: Artifact Rarity: Rare Cost: {1} {1}: Look at the top three cards of your library

Set: Beta Edition Type: Artifact Rarity: Uncommon Cost: {1} Whenever a player casts a green spell

Oona, Queen of the Fae [From the Vault: Legends] Ox this unique mechanism extracts powerSet: From the Vault: Legends Type: Legendary Creature Faerie Wizard Rarity: Mythic Cost: {3}{U B}{U B}{U B} Flying {X}{U B}: Choose a color. Target opponent exiles the top X cards of their library. For each card of the chosen color exiled this way, create a 1 1 blue and black Faerie Rogue creature token with flying.