Quandrix, the Proof

Quandrix, the Proof card image

Quandrix, the Proof: Legendary Creature - Elder Dragon, Secrets of Strixhaven. MTG card printings, market prices, rulings, and format legality on Mana Grove.

Mana cost
{4}{G}{U}
Mana value
6
Type
Legendary Creature - Elder Dragon
Colour identity
Blue and green (UG)
Power / toughness
6/6
Rarity
Mythic
Set
Secrets of Strixhaven (SOS)
Released
2026-04-24
Collector number
218
Artist
Lucas Graciano
Commander rank
7,876 (by how often it appears in Commander decks)
Keywords
Cascade, Flying, Trample
Commander
Can be your commander

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About Quandrix, the Proof

Quandrix, the Proof is a Magic: The Gathering card, a mythic rare blue and green legendary creature from Secrets of Strixhaven (SOS), an expansion set released in April 2026. It is collector number 218 in that set, with art by Lucas Graciano. It costs {4}{G}{U} (four generic, one blue and one green mana) to cast, for a mana value of 6. It is a 6/6 creature. Its colour identity is blue and green. It is legal in Standard, Pioneer, Modern, Legacy, Vintage, Commander, Duel Commander, Oathbreaker, Brawl, Standard Brawl, Historic, Timeless, Alchemy and Gladiator. It has been printed in 2 sets. It can be your commander. The latest aggregated market price for this printing is $1.29 (normal finish, as of 2026-11-02).

Card text

Flying, trample

Cascade (When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order.)

Instant and sorcery spells you cast from your hand have cascade.

Market price

Latest aggregated market price for the normal finish of this printing: $1.29 (as of 2026-11-02).

The figure covers this printing only; other printings carry their own price on their own page.

Format legality

Legality of Quandrix, the Proof by format. Formats in which it is not legal are not listed.

StandardLegal
PioneerLegal
ModernLegal
LegacyLegal
VintageLegal
CommanderLegal
Duel CommanderLegal
OathbreakerLegal
BrawlLegal
Standard BrawlLegal
HistoricLegal
TimelessLegal
AlchemyLegal
GladiatorLegal

Other printings of Quandrix, the Proof

Quandrix, the Proof has been printed in 2 sets. The other printings are listed newest first, with the rarity and release year of each.

PrintingRarityYear
Secrets of Strixhaven Promos (PSOS) #218pMythic2026
Secrets of Strixhaven (SOS) #286Mythic2026

Official rulings

The 8 most recent official rulings for Quandrix, the Proof, newest first.

  • If a spell with cascade is countered, the cascade ability will still resolve normally.
  • The mana value of a split card is determined by the combined mana cost of its two halves. If cascade allows you to cast a split card, you may cast either half (as long as the resulting spell would have lesser mana value than the spell with cascade) but not both halves.
  • When the cascade ability resolves, you must exile cards. The only optional part of the ability is whether or not you cast the last card exiled.
  • If the card has {X} in its mana cost, you must choose 0 as the value of X when casting it without paying its mana cost.
  • If you cast a card "without paying its mana cost," you can't choose to cast it for any alternative costs. You can, however, pay additional costs. If the card has any mandatory additional costs, you must pay those to cast the card.
  • You exile the cards face up. All players will be able to see them.
  • A spell's mana value is determined only by its mana cost. Ignore any alternative costs, additional costs, cost increases, or cost reductions.
  • Not only do you stop exiling cards if you exile a nonland card with lesser mana value than the spell with cascade, but the resulting spell you cast must also have lesser mana value.

Similar cards

Other creature cards with a blue and green colour identity, ranked by how often they appear in Commander decks.

Mentioned in these guides

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