Ascillia, Light Bringer

First strike, vigilance
If your life is five or more than your starting life total, Ascillia, Light Bringer gets +1/+1 and has indestructible, and mentor.
Whenever a creature you control deals combat damage to a player or planeswalker, add {w} to your mana pool, and you may gain 1 life. You don't lose this mana as steps and phases end.