Boon of the Spirit Realm is a rare Enchantment card from Commander Masters (CMM), collector number 720. Current market price: $6.04, TCGplayer market prices via Scryfall.
Constellation — Whenever this enchantment or another enchantment you control enters, put a blessing counter on this enchantment. Creatures you control get +1/+1 for each blessing counter on this enchantment.