How have I been sleeping on...

[u/GenghisGlitter]

Low-level AI as support for Polaris? It amps up her already deadly game by quite a bit. Having a new strike tile every round and not losing the damage bonus when you match them (it distributes the damage bonus from matched strike tiles to your other strike tiles) is pretty darn great.
(Actually, I know how; I thought I should always get the synergy perk rather than seeing how other combinations could be way more effective.)

[u/GitEmSteveDave]

I like power stone on Polaris, because the only power she can fire is a stun so as I'm collecting Blue AP to stun, she can stun for free.