Amko
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Well, it's not that difficult to guess. If the enemy hero is Deydra, you need to pump up anti-magic. If it's Vlad, then anti-summon. But if it's Naadir, I think it's better not to pump anything at all, because you can't pump two anti-magics anyway, and one is useless. Although, if there's an artifact for spellpower on the barbarian, strength against magic would be good.