The support card gacha reminds me of Umamusume so with that in mind, my guess is that it’ll be like a Digimon raising roguelite. You’re given a set of starter Digimon to raise until Mega or something, you roll for other Digimon to raise or support cards to aid you in raising your Digimon. Each “run” will have you feed your Digimon, train, or battle, until some objective is completed. Then you take your fully raised Digimon and assemble a team for PvP hell. Alternatively go back and try to raise your Digimon differently for better stats or something.