I've faced him once on my completion run, pretty terrible results with 10+ team revives. If you're not as bad as I am at Reversed Controls it'll probably be cheaper.
the first time that i fought him i think I spent more than 20 revives between singles and teams, but no units spent. You don't need to, if you can farm items ^_^
I used over 1000 units along with a stash of revives and potions,Mister Sinister is very good for the final 30 percent.It was a very long fight at times I thought I was not going to make it,when I saw the final 5 percent I started to celebrate.
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If you're not as bad as I am at Reversed Controls it'll probably be cheaper.
How close are you to a t5cc?