Cheapest priced copy (Tarkir: Dragonstorm): $0.35 at Card Kingdom, near mint, their price list as of .
Focus the Mind 
Instant · Common · Tarkir: Dragonstorm · #45
This spell costs {2} less to cast if you've cast another spell this turn.
Draw three cards, then discard a card.
Legal inCommanderBrawlStandardPioneerModernLegacyVintagePauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Tarkir: Dragonstorm | 45 | Common | $0.35 | $0.49 |