Power Supplier

Level 2 EARTH/Spellcaster Effect
400 ATK / 400 DEF

Once per turn, you can select 1 face-up monster you control. It gains 400 ATK while you control this face-up card. (A monster cannot gain more than 400 ATK from this card's effect.)

Rulings – Yugipedia

Printings:

Absolute Powerforce: ABPF-EN007 (Common) - 2010-02-12

Prices:

Cardmarket: 0.04 €
TCGplayer: $ 0.14