Ruinous is not an understatement for the power of this iconic character, either
While I have obviously not played this strange un-format yet, I find the premise rather genius
These cards mainly come from sets that take place on the plane, like Amonkhet , Hour of Devastation , and Aetherdrift
Creature Artifact - Scarecrow Color tag templates(None) Venomous Changeling Changeling (This card is every creature type.) Deathtouch Creature - Shapeshifter Color tag templates(None) War-Spike Changeling Changeling (This card is every creature type.) : This creature gains first strike until end of turn
once both are on the field with a single Squirrel, you can sacrifice the Squirrel to Chatterfang, create a Treasure from the Plunderer, and Chatterfang will see that Treasure and create a new Squirrel
A lot depends on how good both players are and how much of a read the players have on each other