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Geometer's Arthropod

{G}{U}

Creature — Fractal Crab

SOSSecrets of Strixhaven#300rare
Borderless
Finishes
Nonfoil · Foil
Border
borderless
Security stamp
oval
Frame
2015
Illustrator
Michael MacRae
CommanderLegalModernLegalStandardLegal
Format legality

Constructed

StandardLegal
PioneerLegal
ModernLegal
LegacyLegal
VintageLegal
PauperNot legal

Commander

CommanderLegal
Pauper CommanderNot legal
Duel CommanderLegal
PreDHNot legal
OathbreakerLegal
Tiny LeadersLegal

Arena

AlchemyLegal
HistoricLegal
TimelessLegal
BrawlLegal
Standard BrawlLegal
Competitive BrawlLegal
GladiatorLegal

Other

PremodernNot legal
Old SchoolNot legal
Penny DreadfulLegal
Future StandardLegal
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 ManipulationX Spell Payoff
Market · per finishtrend updated 9h ago · prices as of Oct 15, 2026
$0.25 low$0.05 gap
$0.37 low$0.21 gap
Cheapest playable copy$0.30· across 3 printings· view the cheapest printing ›

Price history

last 30 days · set by the window above · each finish on its own scale
Nonfoil$0.65-27.0%30D
30D range$0.65to$0.90Since Apr 2026:H $2.99L $0.56
Foil$1.07+0.9%30D1.65× nonfoil
30D range$1.06to$1.16Since Apr 2026:H $10.65L $0.74

Other printings

3 totalCompare all printings
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Found in

2 productsRounded odds
  • Secrets of Strixhaven Collector Booster Pack

    Booster Pack · $48.20

    Nonfoil under 10%Foil under 10%
  • Secrets of Strixhaven Play Booster Pack

    Booster Pack · $4.89

    Nonfoil under 1%Foil under 1%

Rulings

2 · latest Mar 20, 2026
  • 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.