Spark Fiend is a rare Creature — Beast card from Unglued (UGL), collector number 51. Current market price: $0.78, TCGplayer market prices via Scryfall.
When this creature enters, roll two six-sided dice. If you rolled 2, 3, or 12, sacrifice this creature. If you rolled 7 or 11, don't roll dice for this creature during any of your following upkeeps. If you rolled any other total, note that total. At the beginning of your upkeep, roll two six-sided dice. If you rolled 7, sacrifice this creature. If you roll the noted total, don't roll dice for this creature during any of your following upkeeps. Otherwise, do nothing.