Cheapest priced copy (Gatecrash): $0.35 at Card Kingdom, near mint, their price list as of .
Bioshift 
Instant · Common · Gatecrash · #214
Move any number of +1/+1 counters from target creature onto another target creature with the same controller.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
1 printing · $0.35 to $2.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Gatecrash | 214 | Common | $0.35 | $2.99 |
3 rulings from Wizards of the Coast
- 24 January 2013If one of the two creatures is an illegal target when Bioshift tries to resolve, or if the creatures are controlled by different players at that time, no counters will move.
- 24 January 2013You decide how many counters to move when Bioshift resolves.
- 24 January 2013To move a counter from one creature to another, the counter is removed from the first creature and placed on the second. Any abilities that care about a counter being removed or placed on a creature will apply.