Cosmo Brain

Level 7 DARK/Spellcaster Effect
1500 ATK / 2450 DEF

Cannot be Normal Summoned/Set. Must first be Special Summoned by sending 1 non-Effect Monster from your hand or face-up field to the GY. This card gains ATK equal to the Level of the monster sent to the GY this way x 200. You can Tribute 1 Effect Monster; Special Summon 1 Normal Monster from your hand or Deck. You can only use this effect of "Cosmo Brain" once per turn.

Rulings – Yugipedia

Printings:

Cybernetic Horizon: CYHO-EN020 (Common) - 2018-07-26
2019 Gold Sarcophagus Tin Mega Pack: MP19-EN089 (Common) - 2019-08-29

Prices:

Cardmarket: 0.06 €
TCGplayer: $ 0.11