I'd go with HE as he is 5*. also his power control is very usefull, he is r3 worth anyway right now, as it is t2a that somewhat rate, and you don't need it here
as for km, he is all nice and smooth, but damage is really low. HE will be good for long time and gives more arena point
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as for km, he is all nice and smooth, but damage is really low. HE will be good for long time and gives more arena point