Was just looking through the videos on youtube and could not find one for Amumu.
There are many Champions that do not have one.
The Illusive Man
only the post Season 1 champs have them
ez,udyr,sivir and pantheon were pre-season 1 buddy
Every new Champs get one.
Not all of the first 40 Champs have one.
How do you know? You can't just assume things, well unles u know Phreak.
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