Worn Powerstone [Commander Anthology Volume II] XY37 Once per turn (Quick Effect):

Once per turn (Quick Effect): You can detach 1 Material from this card

Set: Platinum: Supreme Victors Type: Grass Rarity: Holo Rare Retreat cost: Colorless

the Dream Mirror Black Knight" once per turn

This card cannot be Special Summoned except by the effect of Transcendent Wings

if Clockwork Avian attacked or blocked this combat

Worn Powerstone [Commander Anthology Volume II] XY37 Once per turn (Quick Effect):Set: Commander Anthology Volume II Type: Artifact Rarity: Uncommon Cost: {3} Worn Powerstone enters the battlefield tapped. {T}: Add {C}{C}. Even a fragment of a powerstone contains within it not just energy, but spacevast dimensions trapped in fragile crystal.