Cheapest priced copy (Champions of Kamigawa): $0.35 at Card Kingdom, near mint, their price list as of .
Petals of Insight 
Sorcery — Arcane · Uncommon · Champions of Kamigawa · #79
Look at the top three cards of your library. You may put those cards on the bottom of your library in any order. If you do, return Petals of Insight to its owner's hand. Otherwise, draw three cards.
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Champions of Kamigawa | 79 | Uncommon | $0.35 | $0.49 |
| Modern Masters | 60 | Common | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 7 June 2013If you choose to put the three cards on the bottom of your library, Petals of Insight will return to your hand directly from the stack. It never goes to a graveyard.