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Well, well. You don't need Anti-Magic either when you're just running around the map against the AI or when your opponent is a weak player! A serious opponent perfectly understands that the Barbarian's biggest weakness is Darkness (as Fireball correctly pointed out), and the Barbarian should understand this too. Yes, Anti-Darkness won't completely negate Darkness – both Subjugation and Berserk will still deal significant damage... but not catastrophic damage!!!!!! Again, I'd like to point out that Subjugation is a 5th-level spell, and it might not even be available, but various slows, curses, and Dispel Magic will definitely be present (well, almost), and if the Barbarian doesn't have Anti-Darkness, these spells will be his death sentence!
Anti-Chaos – there's almost nothing to add here; everything said is correct (personally, I take it against the Tower faction; in other cases, Luck is better).
Anti-Light – in my opinion, it's useful in only one case: when a Knight who focuses on Light is playing against the Barbarian (but you still need to figure out what the Knight will be focusing on:(( ). Since, in my opinion, Knights are the only faction that can compete with the Barbarian even without magic, and with Light, it's just devastating.
Anti-Summoning – utter nonsense!!!!! If anyone knows how it can help, please let me know