Cheapest priced copy (Secrets of Strixhaven Promos): $0.49 at Card Kingdom, near mint, their price list as of .
Geometer's Arthropod 
Creature — Fractal Crab · 1/4 · Rare · Secrets of Strixhaven Promos · #191p
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.
Legal inCommanderBrawlStandardPioneerModernLegacyVintage
Not legal inPauper
3 printings · $0.49 to $0.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Secrets of Strixhaven Promos | 191p | Rare | $0.49 | $0.49 |
| Secrets of Strixhaven | 191 | Rare | $0.49 | $0.49 |
| Secrets of Strixhaven | 300 | Rare | $0.99 | $0.79 |
2 rulings from Wizards of the Coast
- 20 March 2026In 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.
- 20 March 2026Geometer'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.