In this video you will see what strategy I used for my Mage to defeat Hearthstone Curse of Naxxramas Heroic Boss Grand Widow Faerlina.
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My top tips:
1. Start will low mana cards.
2. Drop as many cards as possible on first few rounds.
3. Keep as little cards in your hands as you can. To avoid
4. Try to inflict as much damage as you can as fast as you can.