War Dance is a uncommon Enchantment card from Urza's Saga (USG), collector number 282. Current market price: $0.20, TCGplayer market prices via Scryfall.
At the beginning of your upkeep, you may put a verse counter on this enchantment. Sacrifice this enchantment: Target creature gets +X/+X until end of turn, where X is the number of verse counters on this enchantment.