Cheapest priced copy (Guildpact): $0.79 at Card Kingdom, near mint, their price list as of .
Vedalken Plotter 
Creature — Vedalken Wizard · 1/1 · Uncommon · Guildpact · #41
When this creature enters, exchange control of target land you control and target land an opponent controls.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
2 printings · $0.79 to $2.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander 2011 | 66 | Uncommon | $0.99 | — |
| Guildpact | 41 | Uncommon | $0.79 | $2.49 |
One ruling from Wizards of the Coast
- 1 February 2006If either land becomes an illegal target (or leaves the battlefield) before the ability resolves, the exchange won't happen. There's no way for you to gain a land without losing another one in the process.