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Edited for truth.

I think that it should have costed 2-3 mana less but then not have Rebound :/
In that case it would have been viable. As it is now, I don't think it's worth a slot. You might wanna test it instead...

Assuming that you have the Chant-effect of course.
If that is not the case they'll have Spell Snare and Stifles as well (and sometimes even Clique).
Plus you have to expect Burnspells when you have...