In most cases these cards are basically identical, but because you can respond to the life gain from Armadillo Cloak, there are a number of little tricks players can do to manipulate things, such as casting a burn spell in response to the trigger, or copying the ability while its on the stack
For example, Nicol Bolas the Ravager will exile himself and return to the battlefield transformed into Nicol Bolas, the Arisen by paying four generic, one blue, one black, and one red mana
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"Out of curiosity, does Priest of the Crossing from the Aetherdrift commander decks not violate the spirit of the reserved list by being very similar to and essentially strictly better than Asmira, Holy Avenger?"