Late to the party but I think it's pretty decent. It cantrips to replace itself in hand, it answers things that few other cards can, and has a ton of flexibility in what it can do. .
It'll shut down Thoracle, yes, as well as
Craterhoof Behemoth or
Gray Merchant of Asphodel for the more casual setting. That won't win you the game, but often it means a big tempo swing for the person trying to go off, usually there's a fair amount of resource going into that.
It also shuts down attack triggers, for something like, say
Isshin, Two Heavens as One or
Kaalia of the Vast or
Sun Titan or whatever.
Notably, and dissimilarly to
Humility, the creatures keep their stats, so I guess that could be useful to hose a keyword attack or get through with your own tokens or whatever.
The other neat trick I've heard of is playing it end of the end step so it'll last through an opponent's full turn before going to the graveyard. I guess if you know the strike is coming you can save yourself a turn cycle to figure something out.
I think it's pretty cool.