Cheapest priced copy (Secrets of Strixhaven Commander): $0.99 at Card Kingdom, near mint, their price list as of .
Manaform Hellkite 
Creature — Dragon · 4/4 · Mythic · Innistrad: Crimson Vow · #380
Flying
Whenever you cast a noncreature spell, create an X/X red Dragon Illusion creature token with flying and haste, where X is the amount of mana spent to cast that spell. Exile that token at the beginning of the next end step.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
7 printings · $0.99 to $19.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Innistrad: Double Feature | 437 | Mythic | $1.79 | $19.99 |
| Innistrad: Crimson Vow Promos | 170p | Mythic | $4.99 | $3.99 |
| Innistrad: Crimson Vow Promos | 170s | Mythic | — | $7.49 |
| Secrets of Strixhaven Commander | 248 | Mythic | $0.99 | — |
| Tarkir: Dragonstorm Commander | 224 | Mythic | $0.99 | — |
| Innistrad: Crimson Vow | 170 | Mythic | $0.99 | $2.49 |
| Innistrad: Crimson Vow | 380 | Mythic | $1.99 | $3.49 |
One ruling from Wizards of the Coast
- 19 November 2021Manaform Hellkite's triggered ability looks at the mana that was actually spent to cast the spell, which may be different than the mana cost of that spell. For example, if you cast a noncreature spell without paying its mana cost, this ability creates a 0/0 Dragon Illusion token. In most cases, such a creature would immediately be put into your graveyard.