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Geometer's Arthropod (191p)

PSOS · Secrets of Strixhaven Promos · rare

Mana cost
Mana value	2.0
Type	Creature — Fractal Crab
Rarity	rare
Colors	G, U
Power / Toughness	1 / 4
EDHREC rank	10204
Promo	Yes

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.

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

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Printings

Secrets of Strixhaven $0.29 Secrets of Strixhaven Promos $0.45 Secrets of Strixhaven $0.78

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Legality

Rulings

• 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 {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.
• 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.