Hecate

The Hecates are a series of 3 monsters appearing in the Yu-Gi-Oh! first series anime. Together they combine to form "Gorgon". They also exist as cards in the Bandai card game.

Anime appearance
Anzu Mazaki got the card "Violet Hecate" after buying a pack of Magic and Wizards cards. Yugi Mutou told her how rare it was. Anzu let Yugi keep it as a symbol of their friendship.

Risa Kageyama and her sisters stole the card off Yugi. When Yugi came to get it back, they took the Millennium Puzzle from him and forced him into a Duel. Dark Yugi was unable to come out, sinec Yugi was without the Puzzle.

When Yugi was about to lose, Seto Kaiba stepped to finish the Duel in place of him. He let the sisters put "Violet Hecate" into their Deck for the Duel. They Summoned the 3 "Hecates" and used them to Summon "Gorgon", which equally matched Kaiba's "Blue-Eyes White Dragon" in strength. Kaiba Summoned a second "Blue-Eyes White Dragon". Using both of them he was able to destroy "Gorgon" and defeat the sisters. He explained that he should be the one to defeat Yugi.