Take Doom to r3. He’s more versatile than Professor X and can be used for more lanes. Mags is already overpowered, so he will still flatten metal champs at R2. I just finished exploring both 7.1 and 7.2 and I am currently half way through with 7.3 for what it’s worth. I have Prof X and Mags at R3, and they are definitely worth taking them there eventually. However, Doom should probably go up first.