Powder Keg (Jakub Slemr) [World Championship Decks 1999] AR5 you may play that card

you may play that card without paying its mana cost

which takes on the appearance of the nearby rock

Exile up to two creature cards put into graveyards this way

If this card is sent to the Graveyard for a Synchro Summon that uses 2 or more Tuner monsters as Materials: You can Special Summon 1 FIRE Fiend-Type monster from your Deck in Defense Position

Powder Keg (Jakub Slemr) [World Championship Decks 1999] AR5 you may play that cardSet: World Championship Decks 1999 Type: Artifact Rarity: 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 mana value equal to the number of fuse counters on Powder Keg.