I guess this deck would be spiked a little by adding brainstorm instead of preordain, and swapping out a whole bunch of islands for fetches.  Maybe.  Prob not worth it for casual, but maybe playtest to see if it matters.  BTW, saw a good argument online that eot brainstorm is not the right play usually - instead, wait to draw another card.  The lost U during your during likely doesn't compare to being able to see another card...  Not 100% sure if it's true...

Another site had some simulations showing that for digging for combo pieces, the rank is: ponder, preordain, brainstorm

MYstic speculation is apparently as good as preordain at digging for stuff, but the lack of a draw has to hurt...

Note: both standstill and torpor orb seem potentially good here.  Torpor orb is pretty obvious, but standstill may be good because you really just want to sit and wait if you aren't playing the combo...

This deck is basically bad if you don't get phyrexian dreadnought.  Another version reduces the reliance on dreadnought and brings in frost walker to be more of a tempo deck.  I think thing in the ice could work well (not for tempo), but for adding resiliency and control to this combo deck.  ie, if you can't mull to dreadnought, a thing in the ice and a ponder might get you there.  Cards to remove... so far (limited testing), I haven't seen much need for the owl.  Mizzium skin could be reduced, as could misdirection.

trickbind may be a good card (more versatile than vision charm).  Cloudform could be great, but you'd definitely want brainstorm (I'd think).  Would be nice to try a version with TITI, cloudform, fetches, and brainstorms -see if it's any better.  Mizzium skin and judge's familiar have not been helpful so far.  I could see daze being decent, but not sure.

Also see if you can fit standstill without reworking the whole deck