Muffet's Pet was added in Beta 2.4 update. Previous Versions can be found here.

When placed, this monster will kill any monster with 2 or less ATK, this means it can kill enemies such as Heats Flamesman, Sans, Monster Kid, Goner Kid and even Mettaton but also cards that have high HP such as Ice, and those who mostly have no attack on their own, but have an ability that activates each turn or each attack, such as Memorial Statue, Cactus, Blue Laser, Orange Laser, Pyrope and Gaster. This makes it incredibly valuable and it is suggested one should have this in their decks much like the Nacarat Jester.

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