Arena, no question. Consider them to be a lite-version of Siphi + Rotos. Pair them with Arbiter and someone like Kimi for awesomesauceness.

Speed booster and extra smacks is how I see them paired a lot too. 

I need an updated Angwil roster. 1) Better paring advice 2) Just wanna see it lol

I  was  afraid  someone  would  ask  lol

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I  was  thinking  maybe  Arbiter  and  Lyssandra?

Yep, especially an Immunity/Stoneskin Lyssandra. Get Lix clearing those debuffs and smacking even sooner.

Can also try an Immunity Lyss, Tormin, Lix and Astralon combo. Where I start running into issues is when the enemy team is just doing too much for me to effectively counter everthing.

Also you have Gliseah and I am super jealous. I just love her design and kit. I dumped my entire shard saving on her 10x stuff and have never recovered. Le sigh.

I'll  be  honest  I  haven't  put  her  to  use  yet  but  I  love  the  kit  and  I  think  she's  my  favorite  visual  design.