Vennominaga, The Diety Of Poisonous Snakes

Vennominaga is the boss monster of the Venom archetype from the Yu-Gi-Oh Trading Card Game. She has a unique win condition effect, much like Exodia. When she deals damage to an opponent they get a Venom counter, and a player with 3 Venom counters automatically loses the duel regardless of how many Life Points they have. She is summoned in the anime by Thelonious Viper in a three part duel with Jaden Yuki in episodes 117, 118 and 119 of Yu-Gi-Oh GX.