If we wanted, say, Wrath insurance, we could Convoke for something like Selfless SpiritSelfless Spirit, keeping our army alive so that it can continue to pump out tons more mana
Each of the small cells will hold about 50 double sleeved cards, more if single or unsleeved
Not only that, but casting a creature using that mana means that spell cant be countered
I pulled a Charizard ex and a Kangaskhan ex, and both look like relatively standard poses meant to make the Pokmon look intense or powerful
They can be played alongside high-cost cards in order to spend your extra ink and develop your board, they can get buffed by a Support character like Rolly and become a cheap way to trade up into bigger threats, and Lucky can discover them when you use his ability Good as New, making them more valuable in your deck than in your hand
They apparently are miniature size seeing the various items on the floor around them (such as the giant coin)