Powder Keg (Jakub Slemr) [World Championship Decks 1999] Aura // Legendary Land If those permanents are exchanged

If those permanents are exchanged this way

"I don't expect you to understand the myriad ways in which you're about to die

Set: Unlimited Edition Type: Sorcery Rarity: Rare Cost: {B} Remove Contract from Below from your deck before playing if you're not playing for ante

Whose present courage may beat down our foes

Set: Antiquities Type: Artifact Rarity: Rare Cost: {1} {X}

Powder Keg (Jakub Slemr) [World Championship Decks 1999] Aura // Legendary Land If those permanents are exchangedSet: 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.