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Another important point why Atraxa is "only" rated as a high power commander, is because in her commander identity you have already the top partner pairing of TnT = Thrasios, Triton Hero + Tymna the Weaver

1 2 "Final Fantasy XIV: Shadowbringers - Vows of Virtue, Deeds of Cruelty"

Arena of the Ancients does shut down legendary creatures, but the effect is symmetrical, so unless you specifically craft a deck that avoids them, it's going to impact you too

So when your summon's time is up and it goes to the graveyard, it's going to trigger Yuna, and she'll pop three or four +1/+1 counters onto another creature, powering it up

I encourage you to call up your LGS before placing an order to see if they are selling these products as well