You don't need a healer or reviver for CB. Teams pretty much rely on either unkillable/block damage to avoid needing to worry about damage at all, or they use the Leech debuff along with Warmaster or Giantslayer mastery to essentially heal themselves to full on each attack.
For you, since you have Roshcard the Tower, that is 100% what you should be building your CB team around. Specifically, you are going to want to use one of these three teams:
https://deadwoodjedi.com/speed-tunes/slow-tower-skullcrusher-unkillable/ - a good starter team for you, since the speeds are less intense
https://deadwoodjedi.com/speed-tunes/fast-tower-skullcrusher-unkillable-copy/ - better than the above because it has less specific requirements, but needs faster speeds
https://deadwoodjedi.com/speed-tunes/fast-tower-skullcrusher-w-43/ - works particularly well when you have a 4:3 champ that you want to use
Specifically you want to go with the last one eventually, because you are going to want to use Fatman to add Ally-Attack on a 4:3 rotation.
But, for now, go with the starter slow tower skullcrusher one. You'll want to use Doompriest as your cleanser, and you'll want Fatman and Rathalos for your DPS spots.