Nasus, Curator of the sands.

When Nasus gains +1/+1 for each creature
died this game.
If Nasus have more than 10 power, give him "barrier", "first strike" and "vigilance.
If Nasus have more than 15 power all alies
gain +5/+5.
If Nasus have more than 20 power all
enemies gain -2/-2.