GQuuuuuuX (Omega Psycommu).

What moves the price of this card

The GQuuuuuuX (Omega Psycommu) on this page is the Holofoil printing from Dual Impact, and it trades at $2.10 in near mint condition. The same name is on 8 other printings: Dual Impact GD02-038 at $449.51, Gundam Promotional Cards ST06-002 at $81.99, Starter Deck 06: Clan Unity ST06-001 at $41.21, Steel Requiem GD03-034 at $23.92, Dual Impact GD02-038 at $15.75, Starter Deck 12: Raging Onslaught ST12-005 at $15.01, Starter Deck 06: Clan Unity ST06-002 at $10.43, Steel Requiem GD03-034 at $5.17, so read the set, the number and the rarity together before comparing prices.

Condition does most of the work below the surface. A copy with soft corners or a print line off centre trades well under the market price shown here, and a copy clean enough to grade trades well above it. Before you value your own copy, look at the corners under a light and check the centring on the back, where most cards give themselves away.