The short answer is "because I feel like it." The long answer is that in my original 60-card version, Curse of the Bloody Tome and Devious Cover-Up are two of the (few) win conditions. The idea with this deck is to still plan on milling the opponent out, but without having to play either. Hence, 85 cards. Playing the full playset of Mystical Teachings (60-card version only plays 3) mitigates (but doesn't eliminate) the inherent inconsistency that comes with playing more than 60. We're also running other card-selection effects in the form of Preordain and Brainstorm, as well as a playset of Think Twice.
Capsize, not technically a win condition, but is far and away my preferred method of prompting a concession because I love the ability to deny my opponents fun of any kind; casting this with buyback twice per turn cycle is just ... filthy. I love it.
And of course, good ol' decking is always a relevant option (unless we happen to be up against an 86-card deck...), because why include more win conditions when instead we can just ... Not Lose
Tragic Slip will take down anything in the format for if morbid is triggered; it's especially fun to play after an edict effect when our opponent thinks they got away with only sacrificing their smaller creature
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