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The number of excavated cards and milled monsters are based on the opponent's board when this card is flipped, so it is useless in Turn 1

White decks can easily flood the field with creatures, allowing for an aggressive monowhite deck to become part of the metagame

I'm also concerned that it doesn't mesh well with the Izzet deck (because this card itself is heavy)

While its overall play rate in Commander remains low, its supply is even lower, and the effect it grants is useful and flexible enough for it to warrant consideration in a wide variety of decks

Yes, this is a pretty big change, with about 700 cards slated to receive errata and many more changing functionally even though their text will remain the same