Its strongest attack and the one that really puts it onto this list is the Frenzied Gouging attack
It's not possible to put a permanent card into your graveyard during the end step in time to have the ability trigger
Having the ability to name, say, Human against an Eldrazi deck with multiple Noble Hierarchs on the board gives the card some extra play and makes decisions involving the call more dense
Costing every color but red, Atraxa is an Angel Horror that takes full advantage of the game's many different counter types, from +1/+1 counters to poison counters and Planeswalker loyalty counters
Infinite Combos From a Commander perspective, theres really no way around this issue, which is a problem for rule 0
Like Shining Fates and Champions Path, players wont be able to get these cards via Booster Boxes