Mathmech Diameter

Tuner Effect Monster

Mathmech Diameter is a Tuner Effect Monster (LIGHT/Cyberse, Level 4) with 1000 ATK / 1500 DEF. First printed in Rise of the Duelist (2020).

Type: Tuner Monster
Attribute: LIGHT
Monster type: Cyberse
Level: 4
ATK / DEF: 1000 / 1500
Archetype: Mathmech
Banlist: Unlimited in the TCG, OCG, and Master Duel
TCG release: 2020-08-06
Printings: 1

Card text

When this card is Normal Summoned: You can target 1 Level 4 Cyberse monster in your GY; Special Summon it, but it cannot activate its effects. A "Mathmech" monster that was Synchro or Xyz Summoned using this card on the field as material gains the following effect. ●Once per turn, during the turn this card was Special Summoned, when your opponent activates a card or effect (Quick Effect): You can negate that effect. You can only use each effect of "Mathmech Diameter" once per turn.

Approximate value

≈$0.25

A rough figure from recent listings (updated 2026-06-09), not a market value or official price. It varies a lot with printing, condition, edition, rarity, and grading. Check current listings below before buying or selling.

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Printings & rarities

All printings →

Set	Set code	Rarity	Release	Price*
Rise of the Duelist	ROTD-EN028	Common	2020-08-06	$2.06

*Approximate, from recent marketplace listings, not market values.