Hi. cool version but you might want to consider if you want a mill deck or something else because this isn't a mill deck and Glimpse the Unthinkable only ever goes into those decks.

You could consider Countersquall if you get some more draw synergy Chasm Skulker would be a cool option with cards like Remand Serum Visions Slip Through Space

Draknar50, mill might not be the most common win condition for the deck, but the horrors do give it a lot of mill synergy which is why I GtU in there along with the milling counterspells. Definitely like the look of Slip Through Space though.

I know the deck does not quite fit into any archetype, but then I'm not expecting to win a GP with it, I find it more fun to try and come up with something more unique. I would like to try and cover any weaknesses with a sensible sideboard though which as you can see from the nonsense in there currently I am struggling with.

I guess I am going to have to bite the bullet and get the main deck built and see how it goes, I can come back to the SB later.

I get it and i appreciate the idea it sounds like a few good combos and you could do well with it. As far as sideboard is concerned dont have a lot of experience there but Echoing Truth is always a good option vs token decks

Vapor Snag or Void Snare would both be superior choices to Boomerang aswell just thought of that. The latter if u are worried about planeswalker/enchantments and the first if just creatures

Draknar50 good call on Void Snare, the extra mana on Boomerang is not worth it just to have the option to remove lands, this isn't EDH after all.

Glad i could help ;)

Just remembered Spreading Seas vs tron or scapeshift valakut for sideboard aswell

After looking those up they look horrible. I'm not familiar enough with the modern meta but if land based combos are not uncommon it would be good to sideboard an answer. And here I was thinking that lands were only a threat in EDH.

The combos look horrible, that is, spreading seas seems good.

Valakut, the Molten Pinnacle into Scapeshift or Primeval Titan is meta in modern

Tron with urza's lands is common aswell. And eldrazi with Cavern of Souls + Eldrazi Temple is just annoying

Spreading Seas will either take care of them all or at the very least delay them

Blood Moon is the go to option agaisnt those decks but unless you want to waste a lot of cash on a sideboard option and splash red i would just go with Spreading Seas (sorry for all the comments I keep remembering new stuff to say xD)

Yeah, the deck is expensive enough without adding blood moon... :)