Powder Keg is a rare Artifact card from Magic Player Rewards 2004 (P04), collector number 1. Current market price: — (foil $69.89), TCGplayer market prices via Scryfall.
At the beginning of your upkeep, you may put a fuse counter on this artifact. {T}, Sacrifice this artifact: Destroy each artifact and creature with mana value equal to the number of fuse counters on this artifact.