Beastmaster Ascension is a rare Enchantment card from Zendikar (ZEN), collector number 159. Current market price: $8.04 (foil $22.15), 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.