Beastmaster Ascension is a rare Enchantment card from Secret Lair Drop (SLD), collector number 1609. Current market price: $24.55 (foil $27.27), TCGplayer market prices via Scryfall.
Whenever a creature you control attacks, you may put a quest counter on this enchantment. As long as this enchantment has seven or more quest counters on it, creatures you control get +5/+5.