Cheapest priced copy (The List): $2.99 at Card Kingdom, foil, near mint, their price list as of .
Puca's Mischief 
Enchantment · Rare · Shadowmoor · #47
At the beginning of your upkeep, you may exchange control of target nonland permanent you control and target nonland permanent an opponent controls with equal or lesser mana value.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
3 printings · $2.99 to $24.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| The List | SHM-47 | Rare | — | $2.99 |
| Shadowmoor | 47 | Rare | $4.49 | $12.99 |
| Secret Lair Drop (Lucky Purple Memento) | 923 | Rare | — | $24.99 |
3 rulings from Wizards of the Coast
- 1 May 2008Even if you don't plan on exchanging control of any permanents, if you can choose two legal targets when the ability triggers, you must do so. If you can't, then you don't choose any targets.
- 1 May 2008If either one of the targets becomes illegal (because it leaves the battlefield or for any other reason) by the time the ability resolves, the exchange won't happen. If both targets become illegal, the ability doesn't resolve.
- 1 May 2008You choose two targets such that as a set, all of the targeting conditions are met. That means, for example, that if you control a nonland permanent whose mana value is lower than any of your opponents' nonland permanents, you can't choose it as a target. (If you did, you'd be unable to choose a second target.)