Safia of Siluias

First strike, Vigilance, Hexproof
Affinity for Soldiers (This card cost {1} less
mana to cast for each Soldier you control.)
Whenever another creature enters the battlefield
put a +1/+1 counter on Safia of Siluias.
Whenever another creature under your control
leaves the battlefield put a -1/-1 counter on
Safia of Siluias.