The only card art that matters is Monstrous Growth, since Portal Second Age, Starter 99 and Starter 2000 versions have a squirrel. Otherwise, cut if for a better card.

If your pod allows for silver borders, here's more squirrels

1 Acornelia, Fashionable Filcher

1 Chittering Doom

1 Earl of Squirrel

1 Everythingamajig

1 Form of the Squirrel

1 Giant Fan

1 Snickering Squirrel

1 Squirrel Dealer

1 Squirrel Farm

1 Squirrel-Powered Scheme

1 Steel Squirrel

Swap out

1 Tireless Provisioner

1 Chittering Witch

1 Creakwood Liege

1 Endrek Sahr, Master Breeder

1 Wolfbriar Elemental

1 Spider Spawning

1 Arachnogenesis

1 Bloodforged Battle-Axe

1 Prying Blade

1 Goldvein Pick

1 Tempting Contract

Powers down the deck a bit, but more Squirrels = more Fun!