Cortana

At the beginning of your upkeep, place a Rampancy counter onto Cortana. If she has more than 7 counters on her, exile Cortana.
{t}{u}Remove a counter.
{4}{u}Equip Cortana to target Spartan. It has Trample, Vigilance, and Lifelink.
Don't make a girl a promise, if you know you can't keep it. -Cortana