Cheapest priced copy (Planeshift): $0.79 at Card Kingdom, near mint, their price list as of .
Planeswalker's Favor 
Enchantment · Rare · Planeshift · #86
{3}{G}: Target opponent reveals a card at random from their hand. Target creature gets +X/+X until end of turn, where X is the revealed card's mana value.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
1 printing · $0.79 to $8.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Planeshift | 86 | Rare | $0.79 | $8.99 |
One ruling from Wizards of the Coast
- 4 October 2004If the opponent has no cards in hand, then X is zero.