Kiala, Perpetual Guide

Indestructible
When Kiala, Eternal Guide enters the battlefield,
mill the top 7 cards of your library then exile
three of those cards with a lost counter on them.
As long as you have not gained or lost life this
turn, Kiala is not a creature.
{p/b}{p/w}:You may cast a card you own with a lost
counter on it from exile this turn.