If you play GHoN you can use 2x40 Skeletons and use Ossific Diadem + Lord of Nagashizzar to empower them. Skeletons attack up to the third line, so it's easy to make a lot of attacks to kill big elite units. A block of 40 Skeletons, 4-5 attacks (command trait + a Vampire Lord) + Van Hel = kill.
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