Cheapest priced copy (Journey into Nyx): $0.35 at Card Kingdom, near mint, their price list as of .
Knowledge and Power 
Enchantment · Uncommon · Journey into Nyx · #101
Whenever you scry, you may pay {2}. If you do, this enchantment deals 2 damage to any target.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Journey into Nyx | 101 | Uncommon | $0.35 | $0.49 |
2 rulings from Wizards of the Coast
- 26 April 2014Knowledge and Power's ability triggers only once each time you scry, no matter how many cards you look at.
- 26 April 2014You choose the target of the ability as it's put on the stack. You choose whether to pay {2} as it resolves. You can pay {2} only once each time you scry.