Id mention more of the very minor complaints I had with Magic: The Gathering Arena, but I dont doubt that most of them will be altered before the game reaches beta later this year
Black Mages in FF usually deal damage in the form of spells (fire, ice, thunder), and in MTG they translate to dealing damage after you cast a noncreature spell

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If enough -1/-1 counters are put on a creature you control at the same time to make its toughness 0 or less, Host of the Hereafter's last ability will see all of the +1/+1 counters it had when it died as well as the -1/-1 counters it had, and the same number of each of those types of counters (plus any other applicable counters) will be put onto the target creature