Cheapest priced copy (Strixhaven: School of Mages): $0.99 at Card Kingdom, near mint, their price list as of .
Velomachus Lorehold 
Legendary Creature — Elder Dragon · 5/5 · Mythic · Tarkir: Dragonstorm Commander · #309
Flying, vigilance, haste
Whenever Velomachus Lorehold attacks, look at the top seven cards of your library. You may cast an instant or sorcery spell with mana value less than or equal to Velomachus Lorehold's power from among them without paying its mana cost. Put the rest on the bottom of your library in a random order.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
5 printings · $0.99 to $12.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Strixhaven: School of Mages Promos | 245p | Mythic | $1.29 | $1.49 |
| Strixhaven: School of Mages Promos | 245s | Mythic | — | $9.99 |
| Strixhaven: School of Mages | 245 | Mythic | $0.99 | $1.99 |
| Strixhaven: School of Mages | 283 | Mythic | $2.99 | $12.99 |
| Tarkir: Dragonstorm Commander | 309 | Mythic | $0.99 | — |
3 rulings from Wizards of the Coast
- 16 April 2021When Velomachus Lorehold’s triggered ability resolves, it lets you cast a spell immediately, ignoring timing restrictions. It does not let you cast that spell later in the turn.
- 16 April 2021If you choose not to cast a spell this way, all of the cards will be put on the bottom of the library in a random order.
- 16 April 2021If you’re casting a spell with {X} in its cost without paying its mana cost, you must choose 0 for the value of X.