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Having creatures enter the battlefield with at least one +1/+1 counter gets a lot of support cards rolling, be it Rishkar, Peema Renegade or Atraxa, Praetors' Voice, and sets up payoffs like Inspiring Call

I bet well see more tiered cards in MTG, and I don't think this is intrinsically tied to Final Fantasy although the flavor really fits RPGs and their skill progression trees

You can upload custom images, but they have almost every artwork for all cards on the website as well as custom art you can select

In addition to a wide selection of card cases, there are also MTG play-mats and MTG binders to discover

Those are the useful parts