Azmadon
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I play as anyone... it depends on the map, the opponent, and my tactics.
I like Grol (he compensates for the main disadvantage of the hounds and levels up well), Deleb (fast start and territory control + the most "annoying" hero), Agrael (I just like him + initiative)... and Jezebel, Glock, Biara/Nimus (when I get tired of the first ones).
Conclusion: all heroes are good...