Cheapest priced copy (Urza's Destiny): $4.99 at Card Kingdom, near mint, their price list as of .
Sigil of Sleep 
Enchantment — Aura · Common · Urza's Destiny · #46
Enchant creature
Whenever enchanted creature deals damage to a player, return target creature that player controls to its owner's hand.
Legal inCommanderLegacyVintagePauper
Not legal inBrawlStandardPioneerModern
3 printings · $4.99 to $139.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Duel Decks: Venser vs. Koth | 25 | Common | $9.49 | — |
| The List | UDS-46 | Common | — | — |
| Urza's Destiny | 46 | Common | $4.99 | $139.99 |