Cheapest priced copy (Innistrad Remastered): $0.35 at Card Kingdom, near mint, their price list as of .
Bound by Moonsilver 
Enchantment — Aura · Uncommon · Shadows over Innistrad · #7
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.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
3 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Innistrad Remastered | 13 | Common | $0.35 | $0.49 |
| Innistrad Remastered | 335 | Common | $0.35 | $0.49 |
| Shadows over Innistrad | 7 | Uncommon | $0.35 | $0.49 |
2 rulings from Wizards of the Coast
- 8 April 2016You control Bound by Moonsilver even while it enchants an opponent’s creature. Only you can activate its last ability.
- 8 April 2016Activated and triggered abilities of the enchanted creature that would cause it to transform can still be activated or triggered. If those abilities have any other effects, those effects will happen.