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A small clarification regarding summoning and mines... this is what will allow us to rush on small maps, just like Kaspar.
And if you're playing with someone you know or against a Human, you can take Light and Mass Dispel because mass slow against Undead is deadly.
Take Chaos together with the Lord of Cold on small maps for a rush or in a not-too-long game, levels 12-15. If you see an Ice Elemental in the guild and a +50% cold damage amulet on the map.
Luck, if there's a free slot. Deadly Luck is only useful if there are artifacts with similar effects and the opponent is playing WITHOUT LUCK, because a simple -1 is nonsense. And it's completely useless against an Elf with 5+ Luck.
P.S. Oh yes, and I almost forgot... Banshee's Cry is nonsense, IMO. -1 morale is the same as with Deadly Luck, and losing -10% initiative is, of course, not bad, but when the hero has few levels, you don't want to waste an extra one on this skill.