Mercenary Knight

Trample,Vigilance
Whenever a creature dies Mercenary Knight gets +2/+0
{4}{w}: Sacrifice a creature, Tap up to 4 opponent's creatures, if your opponent doesn't have 4 creatures or more place a +1/+2 counter on Mercenary Knight
If you've got the money and you don't order me to kill a dragon, then we can be real friends