Endurance

When Endurance enters the battlefield, choose an order for creatures controlled by your opponents. Endurance fights each of those creatures in the order that you chose (it can only fight if it is still on the battlefield.)
Whenever a creature dealt damage by Endurance this turn dies, put a +1/+1 counter on Endurance.
The third to be released was Endurance, mortal life becoming frail as the Cycle's end approached.