Cheapest priced copy (Portal): $0.35 at Card Kingdom, near mint, their price list as of .
Steadfastness 
Sorcery · Common · Starter 1999 · #27
Creatures you control get +0/+3 until end of turn.
Legal inCommanderLegacyVintagePauper
Not legal inBrawlStandardPioneerModern
2 printings · $0.35 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Portal | 31 | Common | $0.35 | — |
| Starter 1999 | 27 | Common | $0.35 | — |