Its easy to see that WotC wasnt sure what they wanted to do with mouse as a creature type yet, but what we can see is an early glimpse at what they did know: Mice would focus on combat
Terra, Magical Adept / Esper Terra Terra, Magical Adept starts by milling cards and fishing up enchantments, then it flips into Esper Terra to unleash saga-like chapters of value
For now, though, it's totally legal and very, very scary
An extra strong magnetic closure keeps the deck box securely closed, with the capacity to hold 100+ double sleeved cards
The first is Aragorn and Arwen, Wed, a Human Elf Noble that cares about +1/+1 counters and gaining life in true white/green fashion
Gameplay One of the scary things about making a new card type is potentially the lack of points of interaction with it