Finished the first Naxx wing (8/8) used shaman to down all 3 heroic bosses no Alexstraza or freeze mage needed.
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Key to beating Maexnna is getting minions that summon another minion, healers (witch doctor and farseer), taunts (feral spirit, defender of Argus and earth elemental) and AoE. I had one lightning storm in my deck and used it to gain board control, I also used knife juggler to synergize with my summoning minions.
Deck used for final heroic boss:
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