So apparently Nunu's a visionary....

Visionary (P) [new effect] next spell cast is also now enhanced: "After 5 basic attacks, Nunu's next spell cast will cost no Mana and its effects will be upgraded to the next rank: Consume: +160 Damage and +50 Healing Blood Boil: +1% Movement Speed and +5% Attack Speed Ice Blast: +40 Damage and +5% Movement Speed Slow Absolute Zero: +250 Maximum Damage