I think it will be good for the format due to fast mana such as Simian Spirit Guide, Tron Lands and Bouncelands being viable in the format
Creepiness is subjective, and many of these are the ones that I find personally scary, so know that your favorites may not make this list
It lets us make 2/2s when we reanimate creatures, and can bring a creature back to our hand for just one mana too
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It sounds like it produces an infinite loop on its own, but being a replacement effect prevents this from looping on itself
Though spells and abilities that are exiled won't get a chance to resolve, they don't count as being "countered." If Sundial of the Infinite's ability is activated before the end step, any "at the beginning of the end step"-triggered abilities won't get the chance to trigger that turn because the end step is skipped