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Although its unclear what exact function Roshan, Hidden Magister will have overall, it does seem to be particularly good in a disguise/morph build in an assassins deck so you can get assassin attacking triggers for those face-down creatures

That means playing your Sudden Chill song card, You Have Forgotten Me, or any of the other cards that help gain card advantage over your foes

But with a number of varied creatures in your graveyard, you can regularly cycle through your graveyard

Combos Browse all Suggest Tokens Legality Mitotic Ultimus Legendary Creature Ooze Giant This spell costs less to cast, where X is the greatest power among creatures you control

While there are better options for this type of effect, having one stapled to your commander is always handy in a pinch