Warlock will help you out a lot for 5.2.4, he'll be able to stop the healing from masochism. Apart from that just take your top 5 champs cause they all have pretty solid damage. Cap IW might be good for the collector fight since he has really good block proficiency but regardless with the champs you have right now you're most likely gonna require a bunch of revives for those 3 quests. Make sure you got a good stash of potions, revives and units, and just see it through. The collector fight will be a major pain but just stay determined and keep chipping away his health.
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Good luck!