Fireball x4 4 damage for 3 cost, is the best spell dmg.
Poison Gas x3 every turn enemy hero takes 1 dmg. x3 cause some hero can remove it ( darkclaw, moonstalker, priests, for exemple ), and sometimes it can help killing some hard monster.
Lightning Strike x4 3 damage to a hero and a monster, 2nd best mage spell, help dmging hero and removing monsters, x4.
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