This amazing “card back” pattern courtesy of Suzanne Norris, with Haley Fiege’s awesome logo incorporated. The general idea is that if this back is used for all Phylo decks, then the ability to mix and match all subsequent cards will be limitless.

Here is the pdf of the card back, amenable for printing on a full letter size sheet (i.e. perfect for the DIY print up to 6 cards at a time set-up)