Powder Keg

Artifact, 2 (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.
Illus. Dan Frazier

Gatherer Card Rulings [Nov 2009]

• 10/4/2004: Only destroys artifacts and creatures with exactly the specified cost. It does not mean "less than or equal to".
• 10/4/2004: Putting on a counter is optional. If you forget, you can't go back later even if it is something you usually do.

Format Legality	Legal in Vintage, Legacy Banned in Extended, Standard, MTGO Classic
Printings (2/7)	Magic Player Rewards (Special) Urza's Destiny (Rare)