Rumbling Crescendo is a rare Enchantment card from Urza's Saga (USG), collector number 210. Current market price: $0.59, TCGplayer market prices via Scryfall.
At the beginning of your upkeep, you may put a verse counter on this enchantment. {R}, Sacrifice this enchantment: Destroy up to X target lands, where X is the number of verse counters on this enchantment.