Ascendant Warrior

Whenever Ascendant Warrior deals
lethal damage to another creature, put a prisoner counter on
Ascendant Warrior.
Ascendant Warrior gets +1/+1 for each prisoner counter on it.
As long as Ascendant Warrior has four or more prisoner counters on it, it gains the Noble
subtype and loses Commoner.
Prowess in battle was all it took to be a noble.