Jaxxed

Get to 50 or more Strength in one combat. Ironclad: Limit Break (doubles your current Strength, and can be played repeatedly upgraded) is the engine. Build a bit of Strength via Demon Form, Inflame or Spot Weakness, then chain Limit Break to double it: 10 → 20 → 40 → 80. Two upgraded Limit Breaks off a modest base sail past 50. A high-HP enemy gives you the turns to ramp.