Back to Secrets of Strixhaven Promos

Geometer's Arthropod

{G}{U}

Creature — Fractal Crab

PSOSSecrets of Strixhaven Promos#191prare
Foil

"Creatures that have survived blood-soaked millennia should not be underestimated." —Nev, dean of substance

Border
black
Security stamp
oval
Frame
2015
Illustrator
Joe Slucher
Printings3
CommanderLegalModernLegalStandardLegal
Format legality
AlchemyLegal
BrawlLegal
CommanderLegal
Competitive BrawlLegal
DuelLegal
Future StandardLegal
GladiatorLegal
HistoricLegal
LegacyLegal
ModernLegal
OathbreakerLegal
Old SchoolNot legal
PauperNot legal
Pauper CommanderNot legal
PennyLegal
PioneerLegal
PreDHNot legal
PremodernNot legal
StandardLegal
Standard BrawlLegal
TimelessLegal
Tiny LeadersLegal
VintageLegal
Whenever you cast a spell with {X} in its mana cost, look at the top X cards of your library. Put one of them into your hand and the rest on the bottom of your library in a random order.
1/4

Plays as: Library Manipulation

Market · per finishspark updated 7h ago · prices as of 2026-07-12
Nonfoil+0.0%
$0.69
$0.10 low$0.02 gap
Foil-4.2%
$1.15
$0.49 low$0.39 gap
Cheapest playable copy$0.33· across 3 printings

Rulings

2 · latest Mar 20, 2026 · one tap opens all
  • WotCMar 20, 2026

    Geometer's Arthropod's ability resolves before the spell that caused it to trigger. It resolves even if that spell is countered or otherwise leaves the stack without resolving. In that case, use the value of X as that spell last existed on the stack to determine the value of X for Geometer's Arthropod's ability.

  • WotCMar 20, 2026

    In some rare cases, the value of X for the spell on the stack may be different than the value that was chosen when you cast it. For example, if you control Unbound Flourishing (an enchantment with "Whenever you cast a permanent spell with a mana cost that contains {X}, double the value of X.") the value of X may have been doubled. In those cases, use the value of X as the spell exists on the stack at the time Geometer's Arthropod's ability resolves to determine the value of X for Geometer's Arthropod's ability.