Dragon for sure. Probably in tag team arena but I don't see using him in regular arena other than very particular situations. 

reminder: fusion ends in roughly 2 days, 5 hours from this message

I was just checking to make sure I wasn't too late to rank up all these rares

You don't do that during champ training?

just casually leaving it til the last second, are we 😴

Just finished

What am I, made of time? 😆 

But seriously, had zero time plus a mythical and a legendary to build for Ceeg. So I did that for training. 😎 😎 

I was kidding, sheesh. 😭

I had 1.5 hours left. Positively infinite time compared to Karato.