Cheapest priced copy (Innistrad: Double Feature): $0.35 at Card Kingdom, near mint, their price list as of .
Cradle of Safety 
Enchantment — Aura · Common · Innistrad: Crimson Vow · #54
Flash
Enchant creature you control
When this Aura enters, enchanted creature gains hexproof until end of turn. (It can't be the target of spells or abilities your opponents control.)
Enchanted creature gets +1/+1.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Innistrad: Double Feature | 321 | Common | $0.35 | $0.49 |
| Innistrad: Crimson Vow | 54 | Common | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 19 November 2021If Cradle of Safety leaves the battlefield before its enters-the-battlefield triggered ability resolves, the creature it enchanted as it left gains hexproof until end of turn.