The removal trigger comes upon attacking, so if things go your way then you blow up their best blocker and suddenly Armix puts your opponents into a pickle
Although the Ally token created by the triggered ability is attacking, it was never declared as an attacking creature (for the purposes of abilities that trigger whenever a creature attacks, for example)
Prices pulled directly from TCGplayer highlight a few essential trends: Icon cards dominate : Holo raritiesespecially Charizard, Blastoise, Venusaurcommand huge premiums due to their nostalgia, limited old print runs, and iconic artwork
Choices made for permanents as they entered the battlefield are remembered when they phase in
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That said, the fact that opponents cant use tokens as fodder if you pick the second mode is a notable upside