Worn Powerstone [Commander 2017] XY189 If an Xyz Monster(s) is

If an Xyz Monster(s) is Special Summoned to your field (except during the Damage Step): You can target 1 of those monsters

Set: Crossroads of Chaos Card type: Normal Trap Rarity: Secret Rare Attack: 0 Defense: 0 Activate only when a monster is destroyed by battle and sent to the Graveyard

When Darksteel Reactor has twenty or more charge counters on it

Set: From the Vault: Dragons Type: Creature — Dragon Rarity: Rare Cost: {4}{B}{R}{R}{G} Flying

Set: New Phyrexia Type: Sorcery Rarity: Uncommon Cost: {R}{R}{R}{R} Add {R}{R}{R}{R}{R}{R}{R}

Worn Powerstone [Commander 2017] XY189 If an Xyz Monster(s) isSet: Commander 2017 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.