Kindred

First strike, lifelink {Wb}{Wb}, Add a Marked counter to target creature an opponent controls. Only one creature may have a Marked counter at a time. Whenever a creature an opponent controls is sent to the graveyard from the battlefield, add a +1/+1 counter to Kindred. If a creature with a Marked counter on it is sent to the graveyard from the battlefield add three +1/+1 counters to Kindred.