Lightning, Heroine of Time

Haste, Protection from Demons
At the start of combat, Lightning gains +X/+0,
where X is the amount of life gained this turn.
If X is 5 or more, exile target permanent an
opponent controls until Lightning leaves the battlefield.
Lightning gains First Strike if a creature exiled
with Lightning has First Strike. The same is true
for Lifelink, Indestructible, Flying, Vigilance,
Deathtouch, Menace, Double Strike,
and Trample.