Legendary Atlantean Tridon

Level 3 WATER/Sea Serpent Effect
1600 ATK / 800 DEF

You can Tribute this card and 1 Sea Serpent-Type monster; Special Summon 1 "Poseidra, the Atlantean Dragon" from your hand or Deck, then all monsters your opponent currently controls lose 300 ATK.

Rulings – Yugipedia

Printings:

Lord of the Tachyon Galaxy: LTGY-EN033 (Common) - 2013-05-17
2014 Mega-Tin Mega Pack: MP14-EN019 (Common) - 2014-08-28

Prices:

Cardmarket: 0.04 €
TCGplayer: $ 0.21