Entomb
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The answer is very simple:
1) Necromancy is used to obtain 1 skeleton (so that the same hero can exchange the djinn for a crystal, + necromancy distracts by gathering skeletons).
2) Necropolis - because of the skeleton converter.
3) Behemoth - because of its low speed (a bone dragon could also work - I just didn't bother).
4) Demon - just a picture.
I didn't really aim for a storyline or logical scenario, sorry...
P.S. There's no need to send anything about Fiura - I'm just being slow.
