Fuse counter

Fuse counters are a type of counter introduced in Weatherlight. They have acted as upkeep tracking for sacrificial and destructive abilities.
==Description==
Fuse counters first appeared on <c>Goblin Bomb</c> in Weatherlight. It was an enchantment that would gain or lose a Fuse counter each upkeep based on a flipping a coin. It then had a sacrificial ability to remove 5 Fuse counters from it to deal 20 damage to the target Player or Planeswalker acting almost as an alternate-win condition since most often a player would not have more than 20 life.
They later appeared again in Urza's Destiny on <c>Incendiary</c> and <c>Powder Keg</c>. Incendiary was an aura enchantment that would gain a Fuse counter for each upkeep and then would deal damage to any target once the enchanted creature dies. Powder Keg also optionally gained a Fuse counter for each upkeep and had an activated sacrificial ability to destroy each artifact and creature with a mana value exactly equal to the number of counters. 
In Odyssey the counters appeared on <c>Bomb Squad</c> which was a creature that had an activated ability to place Fuse counters on other creatures. A creature would then be destroyed once it had 4 or more Fuse counters on it deals 4 damage to its controller as well.
==Trivia==
* In Magic Online, Fuse counters are colored green as its considered a positive effect and share their icon with Blaze, Flame, Fury, Shred, Spite and Strife counters.
==References==