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You can develop a strategy for each faction to play against the Chaos faction. For Dwarves, it's beneficial to use the elemental immunity rune on their main stacks; for Mages, play around magnetic golems; for Necromancers, overwhelm with hordes of units; for Elves, resist with the aura of horns; and for Humans, rush with buffs, etc. It all depends on the players' experience.
And of course, take magic resistance skills and artifacts.
Magnetic golems are not very strong on their own, and the rest of the troops will fall quickly. Necromancer's hordes are vulnerable to Chaos. Horn resistance doesn't really save against overwhelming magic.
But it all depends on the game's duration; a quick attack with all troops decides the game against Sinister.