Tayrel, Rearguard Sergeant, Steelskull, Apo and I think Exemplar - unless you have a good poisoner like Frozen Banshee that you're not mentioning? 

Not sure to what extent that comp would need lifesteal, it does have quite a bit of healing but probably not enough to last until the late rounds, of course it also depends on how fast they'd be and whether the healers are booked (to be honest Tayrel and MM are higher priorities for books than Steelskull or RGS, Apo as a rare should be easy to book). Obviously warmaster/giantslayer masteries on everyone. 

Unfortunatelly I don't have better poisoner.

So I need someone with weaken debuff?

Is Rhazin better choice than Exemplar, she seems squishy and I'm not sure I want to invest in her.

I need only two more heroes for fusion so maybe I will be lucky with summons.

Thanks for reply!

I would prefer Kael (poison) over Exemplar, who is pretty useless overall. Steelskull's poison chance is low, he can need an assistant at this job.

Ceterum censeo, the ban of my main account should be undone, I didn't spam, the detection algorithm doesn't work.  

Rhazin is a rockstar for CB. Definitely recommended.

Marksman is slightly better than Kael for poisoning IMO, but he falls off hard, so not sure if it's worth leveling him.

As for lifesteal or heal - the real answer is "neither". You really want leech. Have you got Ghrush yet? He does a pretty good job at it.

The basic team comp for CB is - someone with poison, possibly two poisoners depending on who they are, someone with leech, someone with ATK down, someone with DEF down/weaken, and someone with DEF up/CA.

Maybe screenshot your champ page, possible there are other champs you're missing.

Good, I will try to get heroes for Rhazin fusion. I don't have Ghrush, I will not get him from daily rewards anytime soon. I didn't know about leeach at all, I will look into this, many thanks. Please, have a look at my roster, in case I overlooked someone:

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The  team  I  would  use  is  following:

-  Tayrel

-  Rearguard 

-  Kael

-  Apothacry

-  SteelSkull 

Rhazin  would  replace  Rearguard  -  When  ever  you  get  him.

Your  whole  team  would  need  to  be  in  Lifesteal  gear  with  T6  Masteries.