Cheapest priced copy (Duel Decks: Speed vs. Cunning): $0.35 at Card Kingdom, near mint, their price list as of .
Dauntless Onslaught 
Instant · Uncommon · Theros · #6
Up to two target creatures each get +2/+2 until end of turn.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
5 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Duel Decks: Speed vs. Cunning | 27 | Uncommon | $0.35 | — |
| Duel Decks: Elspeth vs. Kiora | 6 | Uncommon | $0.35 | — |
| Foundations Jumpstart | 98 | Uncommon | $0.35 | — |
| Jumpstart | 99 | Uncommon | $0.35 | — |
| Theros | 6 | Uncommon | $0.35 | $0.49 |