Bound by Moonsilver is a common Enchantment — Aura card from Innistrad Remastered (INR), collector number 335. Current market price: $0.14 (foil $0.29), TCGplayer market prices via Scryfall.
Enchant creature Enchanted creature can't attack, block, or transform. Sacrifice another permanent: Attach this Aura to target creature. Activate only as a sorcery and only once each turn.