Cheapest priced copy (Commander Legends): $1.79 at Card Kingdom, near mint, their price list as of .
Simic Charm 
Instant · Uncommon · Gatecrash · #195
Choose one —
• Target creature gets +3/+3 until end of turn.
• Permanents you control gain hexproof until end of turn.
• Return target creature to its owner's hand.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
2 printings · $1.79 to $6.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander Legends | 451 | Uncommon | $1.79 | — |
| Gatecrash | 195 | Uncommon | $1.99 | $6.99 |
One ruling from Wizards of the Coast
- 24 January 2013If you choose the second mode, only permanents you control when Simic Charm resolves will gain hexproof. Permanents that come under your control later that turn will not.