They go on to elaborate on this in the release, which you can read below: Bellevue, Wash
Capacity is the last thing to think about
The game offers a premium subscription and in-game currency, but my early sense is that theres plenty to do for free, too
However, his most consistent ability is probably his -1 anyway, as adding a real presence to the board that can pressure your opponent and protect him is pretty great, and there will be times where his ability to start cranking those out on turn 4 just wins you the game
Having a 50/50 chance to exile the blocking creature is nice and being able to pay into it again if you fail is useful
Fighting-types may have raw power, but Fire can turn the heat on early in the game