IG-86 is terrible. So terrible, in fact, I refuse to promote him. GA benefits aside (but not ignored), there's an argument to be made that you should simply collect his shards, without promoting him...
If you have HK, 88, and 86 from three years ago when they were the meta, then the post is moot. Those 3 kept me #1 in arena on my shard for 2-4 months. I am definitely not taking 86 to g12 right now, but those 3 still have a lot of good uses. Mine is modded for 186 speed. I am not unhappy I have this character, and if you put full speed gear on IG86 to go first , he will use his special attack which is almost guaranteed to crit and give the droids tm boost. It is a niche in the game now. I team them with Daka and Ewok Elder now often whenever I use them. I don't have a good Ewok or NS team so it works for me. That team chewed through Galactic War fast before it could be simulated, and it is still a decent Grand Arena defense combo if you already have the team. Your opponent will need to bring a worthy team to beat it.
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Share guides, tips, and tricks for Star Wars: Galaxy of Heroes, discuss Arena strats, and help new players get started.