Runebound Tracker

As long as Runebound Tracker has one or more
+1/+1 counters on it, it has infect.
Remove a +1/+1 counter of this creature:
Regenerate Runebound Tracker.
Undying (When this creature dies, if it had no +1/+1
counters on it, return it to the battlefield under its owner's
control with a +1/+1 counter on it.)