Cheapest priced copy (Commander 2019): $0.35 at Card Kingdom, near mint, their price list as of .
Secret Plans 
Enchantment · Uncommon · Khans of Tarkir · #198
Face-down creatures you control get +0/+1.
Whenever a permanent you control is turned face up, draw a card.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
3 printings · $0.35 to $2.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander 2019 | 201 | Uncommon | $0.35 | — |
| Khans of Tarkir | 198 | Uncommon | $0.35 | $0.79 |
| Time Spiral Remastered | 385 | Special | $0.35 | $2.99 |
One ruling from Wizards of the Coast
- 20 September 2014As soon as a creature turns face up, it loses the +0/+1 from Secret Plans. If damage marked on that creature is equal to or greater than its new toughness, the creature will be destroyed.