Pitiless Plunderer

Because even though, yes, squirrels are cute, Chatterfang is very strong.

If you're trying to switch off its combo potential, then the card to watch for here would be Pitiless Plunderer, or potentially War and Soul Trader.

Chatterfang can pay a mana to sacrifice a creature you control and give something plus X minus X.

And whenever Chatterfang sacrifices one of your creatures, the Pitiless Plunderer will make a treasure token.

And since Chatterfang says, whenever you make a token, I'll make another squirrel token to go along with it, you can then use the treasure you've just made for a mana and sacrifice that new squirrel token and do it all over again.

You'll end up nuking the entire board, and if you have a death trigger in play seeing all of those deaths, that's probably game.

You know the drill here.

This one does cost a life every time you use Soul Trader's effect, but if you have an aristocrat effect such as Zulaport or Blood Artist in play to help you gain that life back, then you'll keep your life up and drain everybody else out for game.