Aside from targeted cards, there arent a lot of ways to exile cards from a library en masse
In order for the effect to be maintained, it would be necessary for it to end explicitly in the End Step, just like Final Fortune, which despite talking about the end of the turn had an errata in its text adapting it to the End Step, allowing you to use the card along with Obeka, Brute Chronologist to gain extra turns before losing the game
Slower UR decks can employ Witching Well, Merchant of the Vale, and Sage of the Falls to enable slower threats like Steelgaze Griffin and Mad Ratter
Shroud creatures also attack and block as normal
As ever, well be tracking every card reveal in the Winterspell Card List so you can keep up to date
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