Cheapest priced copy (Legions): $0.35 at Card Kingdom, near mint, their price list as of .
Mistform Seaswift 
Creature — Illusion · 3/1 · Common · Legions · #45
Flying
{1}: This creature becomes the creature type of your choice until end of turn.
Morph {1}{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.)
Legal inCommanderLegacyVintagePauper
Not legal inBrawlStandardPioneerModern
1 printing · $0.35 to $0.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Legions | 45 | Common | $0.35 | $0.99 |