Worn Powerstone [Commander 2014] Mutant Berserker and speedy death

and speedy death

Whenever Dreadhorde Arcanist attacks

Set: World Championship Decks 1998 Type: Instant Rarity: Common Cost: {R} Choose one —

When you get into the swamp

Set: Unknown Event Type: Artifact Creature — Frog Myr Salamander Rarity: Common Cost: {6} Affinity for Affinity (This card costs 1 less to cast for each permanent you control with Affinity

Worn Powerstone [Commander 2014] Mutant Berserker and speedy deathSet: Commander 2014 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.