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.
9/9
Legalities
tlrnot legal
duellegal
brawlnot legal
pennynot legal
PreDHnot legal
futurenot legal
legacylegal
modernnot legal
paupernot legal
alchemynot legal
pioneernot legal
vintagelegal
historicnot legal
standardnot legal
Timelessnot legal
commanderlegal
Gladiatornot legal
Old Schoolnot legal
Premodernnot legal
Oathbreakerlegal
Standard Brawlnot legal
Pauper Commandernot legal
Context
Across the 3 printings of this card, the trailing-90-day price band runs from $0.29 to $34.49 across 194 observations.
Rarix catalogs 3 distinct printings of this card concept, spanning every set the card has appeared in. The Printings grid below lists each one with its own variant treatment, price, and collector signal.
Card type: Legendary Enchantment Creature — Horror. Color identity: black. Mana cost: {4}{B}{B}{B} (7 converted).
Legal in Legacy, Vintage, and Commander.
EDHrec ranks this card concept #4,736 in Commander, putting it in the niche-pick tier of the format's playable pool.
The representative printing on this page is illustrated by Nikola Matkovic.