Engineered Explosives is a rare Artifact card from Double Masters (2XM), collector number 252. Current market price: $4.89 (foil $5.48), TCGplayer market prices via Scryfall.
Sunburst (This artifact enters with a charge counter on it for each color of mana spent to cast it.) {2}, Sacrifice this artifact: Destroy each nonland permanent with mana value equal to the number of charge counters on this artifact.