Does a card played from the champion zone count as a card "not played from hand" for effects like Rek'Sai Breacher that trigger on cards played from anywhere other than hand?

Ruling: Yes, a card played from the champion zone is considered a card "not played from hand" and will trigger effects that care about cards played from anywhere other than hand.

Sequence:

• Play a champion from the champion zone
• Effects that trigger on cards "not played from hand" will activate (e.g., the champion gains Accelerate from Rek'Sai Breacher)