Incendiary is a uncommon Enchantment — Aura card from Urza's Destiny (UDS), collector number 89. Current market price: $0.27 (foil $5.78), TCGplayer market prices via Scryfall.
Enchant creature At the beginning of your upkeep, you may put a fuse counter on this Aura. When enchanted creature dies, this Aura deals X damage to any target, where X is the number of fuse counters on this Aura.