I have heard people mention that Cassian and OP Luke are good together.

Could someone please share a list.

Same. Following because I want to see what people have to say.

I have a couple of Cassian & Luke lists, both 792 points with 10 activations, that I'm currently treating as my main army, but I've only played a single game with Luke and none with Cassian yet. I'm a Legion noob, so I don't know how good these are:

List 1:

Cassian Andor [112 Points]: A280, Hunter, Offensive Push, Recon Intel

Luke Skywalker [224 Points]: Force Push, Force Reflexes, Tenacity

R2-D2 [50 Points]: C-3PO

4x Rebel Troopers [40 Points each]

Rebel Commandos [48 Points]: DH-447 Sniper

2x Tauntaun Riders [99 Points each]: Comms Jammer, Tenacity

2:

Replaced both Tauntauns with 2 rotary AT-RTs, 1 trooper with a sniper, R2 with K-2 (Jyn's blaster, Comms Jammer), and added Saber Throw (or Jedi Mind Trick) to Luke