Phaoris' Blade
Windfury.
After your hero attacks and kills a minion, this gains +2/+1.
Windfury.
After your hero attacks and kills a minion, this gains +2/+1.
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Even at 5 mana in pool 2, this thing can single-handedly win games. I can't imagine what it must have been like at 4 mana in pool 1.