Geo Genex

Level 6 EARTH/Machine Synchro Effect
1800 ATK / 2800 DEF

"Genex Controller" + 1 or more non-Tuner EARTH monsters
Once per turn, if you control a face-up Level 4 or lower "Genex" monster(s), you can switch the original ATK and DEF of this card until the End Phase, for as long as you control a face-up Level 4 or lower "Genex" monster(s).

Rulings – Yugipedia

Printings:

Duel Terminal 2: DT02-EN035 (Duel Terminal Super Parallel Rare) - 2010-05-25
Hidden Arsenal 2: HA02-EN029 (Secret Rare) - 2010-07-15

Prices:

Cardmarket: 0.70 €
TCGplayer: $ 0.25