Cheapest priced copy (Tarkir: Dragonstorm): $0.49 at Card Kingdom, near mint, their price list as of .
Sage of the Skies 
Creature — Human Monk · 2/3 · Rare · Tarkir: Dragonstorm · #328
When you cast this spell, if you've cast another spell this turn, copy this spell. (The copy becomes a token.)
Flying, lifelink
Legal inCommanderBrawlStandardPioneerModernLegacyVintage
Not legal inPauper
4 printings · $0.49 to $1.79 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Tarkir: Dragonstorm Promos | 22p | Rare | $0.99 | $0.79 |
| Tarkir: Dragonstorm Promos | 22s | Rare | — | $1.79 |
| Tarkir: Dragonstorm | 22 | Rare | $0.49 | $0.79 |
| Tarkir: Dragonstorm | 328 | Rare | $0.49 | $1.49 |