Cheapest priced copy (Foundations Jumpstart): $0.59 at Card Kingdom, near mint, their price list as of .
Starnheim Courser 
Creature — Pegasus · 2/2 · Common · Kaldheim · #32
Flying
Artifact and enchantment spells you cast cost {1} less to cast.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
2 printings · $0.59 to $0.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Foundations Jumpstart | 261 | Common | $0.59 | — |
| Kaldheim | 32 | Common | $0.59 | $0.99 |
2 rulings from Wizards of the Coast
- 5 February 2021To determine the total cost of a spell, start with the mana cost or alternative cost you're paying, add any cost increases, then apply any cost reductions (such as that of Starnheim Courser). The mana value of the spell is determined only by its mana cost, no matter what the total cost to cast the spell was.
- 5 February 2021The cost reduction applies only to generic mana in the costs of artifact and enchantment spells you cast. It can't reduce requirements of specific colors of mana.