Cheapest priced copy (Commander 2013 Oversized): $0.99 at Card Kingdom, foil, near mint, their price list as of .
Prossh, Skyraider of Kher 
Legendary Creature — Dragon · 5/5 · Mythic · Secret Lair Drop · #1717
When you cast this spell, create X 0/1 red Kobold creature tokens named Kobolds of Kher Keep, where X is the amount of mana spent to cast it.
Flying
Sacrifice another creature: Prossh gets +1/+0 until end of turn.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
6 printings · $0.99 to $19.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Masters 25 | 214 | Mythic | $1.29 | $16.99 |
| Commander 2013 | 204 | Mythic | $1.29 | — |
| Commander Legends | 530 | Mythic | — | — |
| Commander 2013 Oversized | 204 | Mythic | — | $0.99 |
| The List | A25-214 | Mythic | $0.99 | — |
| Secret Lair Drop | 1717 | Mythic | $12.99 | $19.99Out of stock |
3 rulings from Wizards of the Coast
- 10 November 2020The first ability triggers when you cast Prossh, not when it enters the battlefield. This means that it will resolve before Prossh, so any Kobold tokens it creates will be put onto the battlefield before Prossh. If Prossh enters the battlefield without being cast, the ability will not trigger.
- 10 November 2020You can't choose to pay extra mana to cast a creature spell unless something instructs you to.
- 10 November 2020The amount of mana you spent to cast this creature is usually equal to its mana value. However, you also include any additional costs you pay, including the commander tax.