Maro's Gone Nuts's name, text and art are references to Mark Rosewater, whose love for squirrels and doubling mechanics is well known. The art is a reference to Look at Me, I'm the DCI, illustrated by Mark Rosewater himself. The card Maro's Gone Nuts looks stickered on is Doubling Season.
Growth Charm's text mention three existing cards cards whose names contain "Growth". The word Charm is a reference to the many charms in MTG that allow a player to choose between effects.
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