Powder Keg [Urza's Destiny] Elspeth Set: Modern Masters 2017 Type:

Set: Modern Masters 2017 Type: Instant Rare Cost: {1}{U} Return target nonland permanent you don't control to its owner's hand

Set: Limited Edition Alpha Type: Artifact Rare Cost: {4} {1}: The next time a source of your choice would deal damage to target creature this turn

Set: Mercadian Masques Type: Instant Rare Cost: {3}{W} You may exile a white card from your hand rather than pay this spell's mana cost

000 Wei by leaving the city gates open and calmly playing the zither

Then that permanent's controller may sacrifice a land

Powder Keg [Urza's Destiny] Elspeth Set: Modern Masters 2017 Type:Set: Urza's Destiny Type: Artifact 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 converted mana cost equal to the number of fuse counters on Powder Keg.