Cheapest priced copy (Duskmourn: House of Horror Commander): $1.29 at Card Kingdom, near mint, their price list as of .
Arvinox, the Mind Flail 
Legendary Enchantment Creature — Horror · 9/9 · Mythic · Duskmourn: House of Horror Commander · #130
Arvinox isn't a creature unless you control three or more permanents you don't own.
At the beginning of your end step, exile the bottom card of each opponent's library face down. For as long as those cards remain exiled, you may look at them, you may cast permanent spells from among them, and you may spend mana as though it were mana of any color to cast those spells.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
3 printings · $1.29 to $22.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Duskmourn: House of Horror Commander | 130 | Mythic | $1.29 | — |
| Secret Lair Drop | 340 | Mythic | $19.99 | $22.99 |
| Universes Within | 1 | Mythic | $1.49 | — |
One ruling from Wizards of the Coast
- 8 November 2024For the purposes of deck construction, format legality, and all rules, abilities, and effects that refer to a card’s name, this card’s name is the same as that of Mind Flayer, the Shadow.