Carmen, Fierce Intellectual

Carmen enters with one knowledge counter. At your upkeep, Carmen gains one knowledge counter. If Carmen has no knowledge counters, exile her.
{u}{t}, Remove one knowledge counter: Draw a card.
{w}{t}, Remove two knowledge counters: Double the counters on target creature.
{t}, Remove ten knowledge counters: Carmen gains flying, first strike, trample, lifelink, and vigilance.
Through scholarship, "Die Luft der Freiheit weht."