Nargott
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Once you draw a Viseryon that can support 5 heroes, then we can think about buffing the Necrodrakes. I was considering not only the general logic of the undead but also the visuals. They don't look equal to the Black Dragons, in my opinion.
They don't have dragon fire/acid, they don't have dragon mass, and even their wings are riddled with holes. All that remains of the dragon in them is fear. They kill with fear/debuffs. Despite their individual weakness, this is a very serious and key unit (the Rock Dragons are especially dangerous - it's no coincidence they have that name; it's hard to kill them with incorporeality, and the debuffs work incredibly well; if a large part of the enemy army is affected by them, the battle is lost).