Well, cards like Hermit Druid, which can mill your entire deck for a single mana if you avoid playing any basic lands, and the repeatable tutoring and graveyard-filling power of Survival of the Fittest are pretty busted, too
Similarly, Altar of Dementia is primarily used in Aurelia to shield my creatures from pointed exile removal, or to mill myself in order to set up reanimation
The win condition aspect is a little clunky, but the ability to trade two mana for a card carries this artifact and proves its importance in creature-based white decks
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However, the reason hes above Thassa is that you can target multiple cards, and its not just limited to Creatures
I run it in my Chainer Reanimator deck, and I use it as a finisher