I can see it being a sweet card in a Kaali (sp?) deck
Consider this Duskmourn Overlord a weak removal spell that suspends a legit wincon, and if you can cast it for the full amount, all the better
Mathas forces your opponents to work together if they want that tasty card draw, by picking off the creatures you put targets on
As this ability resolves, the battle's controller exiles it then casts the back face from exile without paying its mana costand there won't be a mana cost, so that part's easy
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Magic: The Gathering - Ob Nixilis, The Adversary Is A Strong Planeswalker Ob Nixilis, The Adversary is in a strange place gameplay-wise in Magic: The Gathering