Knight of Selflessness

Flash
Knight of Selflessness keeps +1/+1 counters
between zones.
When damage is prevented, put that many +1/+1 counters on Knight of Selflessness.
When Knight of Selflessness enters the battlefield, prevent all damage that would be
dealt to you or permanents you control this turn.
{w}, {t}: Return Knight of Selflessness to your
hand.