Vesta, the Harbinger

When Vesta first planeswalked to escape from the destruction of Rath, she arrived on Zendikar, and was found by a group of Kor trackers. When the Eldrazi emerged, she was asked to escape and find help on other worlds. She found herself on Ravnica, where she met Belric Foma. Vesta agreed to help him control his White Mana if he would help her find allies against the Eldrazi.

Vesta, the Harbinger is a White kor Planeswalker. She costs 2 White and 2 Colorless Mana to play, and begins with 4 Loyalty Counters.

+1 Put a 1/1 Kor Spirit Token onto the battlefield. It has Vigilance.
-4 You gain 1 Life for each tapped creature on the battlefield.
-8 Vesta, the Harbinger becomes an X/X White Kor Avatar Creature, until end of turn; where X equals the number of Kor Spirit Tokens in play. She has Haste, Double Strike, Vigilance and Lifelink.