Mox Opal [Kaladesh Inventions] RC28 You can discard this card

You can discard this card to the Graveyard to add a "Polymerization" from your Deck to your hand

it gains 400 ATK during the Damage Step only

return all cards on the field to their owners' hands

Set: Commander 2017 Type: Legendary Creature — Dragon Avatar Rarity: Rare Cost: {W}{U}{B}{R}{G} Flying

Set: XY: Furious Fists Type: Water Rarity: Ultra Rare Retreat cost: Colorless

Mox Opal [Kaladesh Inventions] RC28 You can discard this cardSet: 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.