Cheapest priced copy (Born of the Gods): $0.49 at Card Kingdom, near mint, their price list as of .
Silent Sentinel 
Creature — Archon · 4/6 · Rare · Commander 2018 · #75
Flying
Whenever this creature attacks, you may return target enchantment card from your graveyard to the battlefield.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
4 printings · $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Born of the Gods | 26 | Rare | $0.49 | $0.49 |
| Commander 2015 | 81 | Rare | $0.49 | — |
| Commander 2018 | 75 | Rare | $0.49 | — |
| Born of the Gods Promos | 26★ | Rare | — | $0.49 |
2 rulings from Wizards of the Coast
- 1 February 2014If the enchantment card is an Aura, you choose a legal player or object for that Aura to enchant as it enters the battlefield. This doesn’t target the player or object, so it’s possible to enchant an opposing creature with hexproof this way, for example. If there’s no player or object the Aura can legally enchant, it stays in the graveyard.
- 1 February 2014If you return an enchantment creature card with bestow to the battlefield, you can’t pay its bestow cost. It won’t be an Aura and can’t be attached to a creature.