Kyre, Who Disdains All

Warlord - Sacrifice two creatures (At the
beginning of your combat step, you may pay this
warlord cost. If you do, this creature become your
warlord as long you don't pay another warlord cost.)
Lifelink, first strike
As long as Kyre is your warlord, it gets +1/+1 for
each creature card in your graveyard.