Cheapest priced copy (Modern Masters): $0.35 at Card Kingdom, near mint, their price list as of .
Bound in Silence 
Kindred Enchantment — Rebel Aura · Uncommon · Future Sight · #20
Enchant creature
Enchanted creature can't attack or block.
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
3 printings · $0.35 to $0.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Future Sight | 20 | Uncommon | $0.49 | $0.99 |
| Modern Masters | 8 | Common | $0.35 | $0.49 |
| Time Spiral Remastered | 10 | Common | $0.35 | $0.49 |
5 rulings from Wizards of the Coast
- 19 March 2021If you put Bound in Silence onto the battlefield without casting it, perhaps using the "recruiting" ability of a card like Amrou Scout, it will enter attached to a creature. You choose that creature as you're putting the Aura onto the battlefield. This doesn't target that creature, so you could have it enter the battlefield attached to a creature an opponent controls with hexproof, for example. If there's no creature on the battlefield it can be attached to, it stays in whatever zone it was in.
- 19 March 2021If Bound in Silence becomes attached to a creature that's already attacking or blocking, the creature continues to attack or block as normal.
- 7 June 2024This cards was originally printed with the "tribal" card type. That card type has been replaced with "kindred". This change does not affect the gameplay function of this card.
- 7 June 2024While it appears only on cards that already have other card types, kindred is a card type and will be counted by effects that refer to the number of card types among cards in a zone.
- 7 June 2024Kindred is a card type that allows noncreature cards to have creature types. For example, Echoes of Eternity is an Eldrazi (although not a creature) while on the battlefield and an Eldrazi card (although not a creature card) in zones other than the battlefield.