The owner of this deck hasn't added a sideboard, they probably should...
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Just do it. Polymorph is broken. Quit complaining about Bloodbraid Elf and ban this broken-ass card.
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It's not broken. It's good only if YOU BASE YOUR ENTIRE DECK AROUND IT. that's the only way that it's reliable.
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Plenty of good uses for polymorph, especially with Jace, and some other similar cards that can produce tutoring effects. And yes, it can be very broken when used in this fashion. I always keep Dispel in sideboard (if not main deck) when abusing Polymorph. Also keep in mind that you're not guaranteed that you'll ever get it, even with card draw. You need to hit 15 cards drawn on average to get a copy of something you have 4 copies of in your deck. Sometimes it will happen much sooner, other times it will never happen before you just sputter out. Beware without Selective Memory you may polymorph a second copy of your legendary!
Just one Polymorph will do the trick, though. These guys don't need protection against anything but Day of Judgement. And yes, it's still broken. Turn 4 Prog isn't broken? You must be smoking something.