Whitehill was brutal for me too, and they were only fights i didn't manage to do no-loss and it was required to do all 3 stacks when i started. Dunno how my stacks looked compared to matt/yours but i didn't see any hope, although i didn't have level 3 diversion/trapper.
Black dragon challenge should be easy for vampire, the summons are really strong in this game, early game phoenix, then call of nature.
As for vampire start, problem are archers, rest you can kite for days with vampires. In Elf Guardian of Light stack, there are elves that basically kill something in 1 shot, if it hits 1 vampire it dies. Trap doesn't help against them, and there are like 100 fairies that can't be trapped. Poison skull isn't reliable enough even on level 2 it can do really low dmg.
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