Aang, Boy of Potential

Airbend — Whenever you gain life, you may tap target untapped creature you control and tap target creature an opponent controls.

{w}: Untap Aang. Prevent all combat damage dealt
to and by Aang. Gain 1 life. Activate only in combat and once each combat before damage is assigned.

“The journey of a thousand miles begins with a single step.” – Aang