Geometer's Arthropod
Creature — Fractal Crab
Whenever you cast a spell with 
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.
"Creatures that have survived blood-soaked millennia should not be underestimated." —Nev, dean of substance
1 / 4
- Set
- Secrets of Strixhaven (SOS #191)
- Rarity
- Rare
- Mana value
- 2
- Released
- 2026-04-24
- Artist
- Joe Slucher
- EDHREC rank
- #10,499
- Colour identity
- Finishes
- Nonfoil, Foil
- Served from
- Local database
Commander bracket
Derived from card traits, not a ruling — bracket rules turn on how a deck intends to use a card. Bracket rules
EDHREC
Combos
Not part of any combo on Commander Spellbook.
Format legality
Rulings
- 2026-03-20
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.
- 2026-03-20
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
, 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.