Goblin Bomb [Weatherlight] Magic 2011 Promos Set: Limited Edition Alpha Type:

Set: Limited Edition Alpha Type: Instant Common Cost: {1}{W} Destroy target artifact or enchantment

Whenever a player casts a spell with converted mana cost equal to the number of charge counters on Chalice of the Void

For example

Set: Commander 2017 Type: Sorcery Rare Cost: {5}{B}{B} Choose a creature type

Goblin Bomb [Weatherlight] Magic 2011 Promos Set: Limited Edition Alpha Type:Set: Weatherlight Type: Enchantment Rare Cost: {1}{R} At the beginning of your upkeep, you may flip a coin. If you win the flip, put a fuse counter on Goblin Bomb. If you lose the flip, remove a fuse counter from Goblin Bomb. Remove five fuse counters from Goblin Bomb and sacrifice it: It deals 20 damage to target player or planeswalker.