Bomb Squad is a rare Creature — Dwarf card from Odyssey (ODY), collector number 179. Current market price: $1.52 (foil $8.99), TCGplayer market prices via Scryfall.
{T}: Put a fuse counter on target creature. At the beginning of your upkeep, put a fuse counter on each creature with a fuse counter on it. Whenever a creature has four or more fuse counters on it, remove all fuse counters from it and destroy it. That creature deals 4 damage to its controller.