Ares, the Last Rival

Whenever a creature dies, you may put two +1/+1 counters on Ares the Last Rival.
If Ares the Last Rival has a power greater than ten
he gains indestructible. If Ares the Last Rival has
a power great than 16, he gains hexproof. If Ares
the last Rival has a power greater than 20, he gains double strike and vigilance. If Ares the Last Rival
has a power greater than 25, he gains protection
from all colors and lifelink.