Sometimes cube look too annoying, especially in Earthquake ruleset, when few monster dies, increasing its effective health and it start self heal of 6-8 health. I have no idea how in Champion league people deal with it. For me at level 5, beating a cube with a healer in Earth quake ruleset is almost impossible.
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Affliction or Stun usually deal with the Cube, one of those typically stops it healing, that and sneak just in case they've got a cleanse card to back it up!
Although if it's a slow rule set don't rely on a fast ranged attack to stun it, it'll miss!
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