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WotC found that having creatures with this effect led to unfun play patterns in Limited, and generally werent played in Constructed

led with 29%, followed by Brazil at 11%, Mexico at 6%, Japan at 4%, France at 4%, the UK at 4%, and Thailand at 4%

This is strong with ping effects, and 1/1 Tims typically cost three, like Prodigal Pyromancer, so this fun thing is just one more and pretty good

Bestow in particular requires some careful consideration here, as while the initial version of a Bestowed Creature will become an Aura, any token copies created by Arna will be unable to be cast for their Bestow cost, hitting the field as Token Creatures instead