Gagagatag

Normal Spell

All "Gagaga" monsters you currently control gain 500 ATK for each "Gagaga" monster you currently control, until your next Standby Phase. You can only activate 1 "Gagagatag" per turn.

Rulings – Yugipedia

Printings:

Shadow Specters: SHSP-EN059 (Common) - 2013-11-08
2014 Mega-Tin Mega Pack: MP14-EN167 (Common) - 2014-08-28

Prices:

Cardmarket: 0.02 €
TCGplayer: $ 0.05