Powder Keg [Urza's Destiny] Spirit Minion Set: From the Vault: Annihilation

Set: From the Vault: Annihilation Type: Sorcery Rarity: Mythic Cost: {2}{W}{W} Each player chooses from among the permanents they control an artifact

Set: Apocalypse Promos Type: Creature — Fungus Beast Rarity: Rare Cost: {4}{B}{G}{U} Trample

"You might as well try to stop the waterfall

Set: Darksteel Type: Instant Rarity: Common Cost: {1}{U} Return target nonland permanent and all other permanents with the same name as that permanent to their owners' hands

but it is not uncontrollable

Powder Keg [Urza's Destiny] Spirit Minion Set: From the Vault: AnnihilationSet: Urza's Destiny 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.