Powder Keg [Magic Player Rewards 2004] Legendary Counter target spell if its

Counter target spell if its converted mana cost is X

They can't be regenerated

For the chronatog

Set: Unlimited Edition Type: Land — Plains Island Rarity: Rare ({T}: Add {W} or {U}

This ability can't cause the total number of +1/+0 counters on Clockwork Avian to be greater than four

Powder Keg [Magic Player Rewards 2004] Legendary Counter target spell if itsSet: Magic Player Rewards 2004 Type: Artifact Rare Cost: {2} At the beginning of your upkeep, you may put a fuse counter on Powder Keg. {T}, Sacrifice Powder Keg: Destroy each artifact and creature with converted mana cost equal to the number of fuse counters on Powder Keg.