Gallia of the Endless Dance is a rare Legendary Creature — Satyr card from Theros Beyond Death Promos (PTHB), collector number 217p. Current market price: $0.33 (foil $0.50), TCGplayer market prices via Scryfall.
Haste Other Satyrs you control get +1/+1 and have haste. Whenever you attack with three or more creatures, you may discard a card at random. If you do, draw two cards.