Cheapest priced copy (Return to Ravnica): $0.49 at Card Kingdom, near mint, their price list as of .
Conjured Currency 
Enchantment · Rare · Return to Ravnica · #33
At the beginning of your upkeep, you may exchange control of this enchantment and target permanent you neither own nor control.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
1 printing · $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Return to Ravnica | 33 | Rare | $0.49 | $0.49 |
3 rulings from Wizards of the Coast
- 1 October 2012The exchange occurs only if Conjured Currency and the target permanent are both on the battlefield and controlled by different players when the ability resolves. In addition, the target permanent must be one you neither own nor control. If any of these things aren’t true when the ability tries to resolve, the exchange won’t happen and neither permanent will change controllers.
- 1 October 2012The only legal target for Conjured Currency’s ability is a permanent both owned and controlled by another player, although it doesn’t have to be the same player. For example, a permanent owned by an opponent but controlled by your teammate (or another opponent) could be chosen as the target.
- 1 October 2012You don’t necessarily have to control Conjured Currency when its ability resolves in order for the exchange to happen. If another player has gained control of Conjured Currency while the ability is on the stack, and a third player controls the target (and you don’t own it), you may choose to have those two players exchange control of the relevant permanents.