Tavi, Guardian of Serenity

Vigilance
{w}Whenever a creature you control is dealt
damage, you may prevent that damage. If you
do, you gain life equal to the prevented damage.
At the beginning of your end step, if Tavi is
exiled, you may return her to the battlefield.
Whenever Tavi or another creature you control
becomes the target of a spell or ability an
opponent controls, you may have Tavi gain
hexproof until end of turn.
"A gift of charity is bringing peace."