Acornelia, Fashionable Filcher (Unfinity Foil Edition) [The List]

Whenever you cast a spell with a squirrel in its art, you get {A} (an acorn counter).

Whenever a Squirrel you control enters the battlefield or dies, you get {A}.

{2}{B}, Pay X {A}: Target creature gets -X/-X until end of turn.

{G}, Pay X {A}: Target creature gets +X/+X until end of turn.