Catalyst Stone [Odyssey] Purple/Yellow Set: Ravnica Allegiance Promos Type:

Set: Ravnica Allegiance Promos Type: Enchantment Rarity: Rare Cost: {3}{G} Whenever a nontoken creature enters the battlefield under your control

{5}{G}{U}: Look at the top five cards of your library

As long as Arixmethes has a slumber counter on it

Set: Black & White: Next Destinies Type: Grass Rarity: Ultra Rare Retreat cost: Colorless

Catalyst Stone [Odyssey] Purple/Yellow Set: Ravnica Allegiance Promos Type:Set: Odyssey Type: Artifact Rarity: Rare Cost: {2} Flashback costs you pay cost up to {2} less. Flashback costs your opponents pay cost {2} more. The gems' incandescence invades the dreams of all who see them.