Vampiric Recruiter

Flying
Whenever Vampiric Recruiter deals combat damage to a player, gain control of target creature of that player's choice he or she controls. Tap that creature. It doesn't untap during your untap step.
Imperialism - As long as you control more creatures than any other player, Vampiric Recruiter gets +1/+1 for each other tapped creature you control and has lifelink.