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There are certainly other decks out there too that can make good use out of Mangara

You can also skip levels by paying Magic Arena's premium currency, gems

Getting a free resurrection stapled to both an increase in lifegain and a redundant Heliod, Sun-Crowned is bonkers good

Dont worry too much about buffing its power for more expensive taxes: it turns out a Rhystic Study that can only trigger once per turn per opponent on noncreature spells is still pretty good

You will need to be prepared to defend her as well because she will become a huge magnet for any sort of removal because your opponents will not want you wiping their boards and will do anything possible to bring down her loyalty