Cheapest priced copy (Commander 2014): $0.35 at Card Kingdom, near mint, their price list as of .
Shaper Parasite 
Creature — Illusion · 2/3 · Common · Planar Chaos · #46
Morph {2}{U} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)
When this creature is turned face up, target creature gets +2/-2 or -2/+2 until end of turn.
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
4 printings · $0.35 to $0.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander 2014 | 125 | Common | $0.35 | — |
| Planar Chaos | 46 | Common | $0.35 | $0.49 |
| The List | C14-125 | Common | $0.35 | — |
| Time Spiral Remastered | 85 | Uncommon | $0.35 | $0.99 |
One ruling from Wizards of the Coast
- 1 February 2007You choose whether the targeted creature gets +2/-2 or -2/+2 as the ability resolves.