Cheapest priced copy (Lorwyn Eclipsed Commander): $0.99 at Card Kingdom, near mint, their price list as of .
Cream of the Crop 
Enchantment · Rare · Morningtide · #117
Whenever a creature you control enters, you may look at the top X cards of your library, where X is that creature's power. If you do, put one of those cards on top of your library and the rest on the bottom of your library in any order.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
2 printings · $0.99 to $79.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Lorwyn Eclipsed Commander | 102 | Rare | $0.99 | — |
| Morningtide | 117 | Rare | $3.99 | $79.99 |
3 rulings from Wizards of the Coast
- 1 April 2008If the creature has 1 power, this ability lets you look at the top card of your library, then you'll have to leave it there.
- 1 April 2008The creature's power is checked as this ability resolves. If the creature has left the battlefield, use its last known information.
- 1 April 2008If the creature has 0 power, this ability has no effect.