How to fix RDM:
Step1)
Nerf geo to the ground
Step2)
Give RDM some type of enfeeble that reduces the damage of mob TP moves and/or a way to reduce mobs TP gain/drain it
RDM also needs to be able to accession haste2 and refresh 2. All of it's enfeebles need to ignore mob resist rates or it's new 1 hour should be 1-5m cd instead of 1 hour.
Honestly, there's no way to make RDM ever useful without nerfing geo the ground. Geo breaks the game in half.