The Magic the Gathering Final Fantasy products featured in this review were provided by Wizards of the Coast.
The baseline is a 2/2 that deals 2 damage to all other creatures, but that scales up if you already had an Army on board
Then, select the deck you want to personalize, and when editing that deck, go to More Details, to the right: Notice that sometimes you may miss and to the Sideboard (which is right above More Options), but what youre looking for is the screen shown below: Within a deck's details, you can set individual preferences for companions, sleeves and avatars for when you play that deck
If you cast a spell with Cascade, you must resolve the Cascade ability
There's both the potentiality of what will be strong in this game, as well as what might be strong given your deck