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* This card made cards like monster appears in the artworks of "[[Lightning VortexSnake Whistle]]", and "[[Abyss Soldier]]", "[[Swap FrogGoblin Circus]]", "[[Tribute to the Doomed]]", and others whose effects required that a card be discarded as a cost, practically costless. * "Sinister Serpent" is featured * This card appears in the artworks first Japanese artwork of "[[Snake Whistle]]", the Japanese "[[Exchange]]" and "[[Goblin Circus]]".
*The Sinister Serpent seems to be based on the Japanese cryptid, Tsuchinoko, a snake wider in the middle than its head and tail. According to a legend of the Tsuchinoko, it has the power to control minds whereas in other legends it just has the power to lie very very well.
* This card is the only [[Reptile]] monster to be forbiddenForbidden.
