Undyne, the Undying

Double strike, Vigilance, Undying 5 (When this creature dies, if it had no +1/+1 counters on it, return
it to the battlefield under its owner's control with
5 +1/+1 counters on it.)
After Undying, Undyne also gets Indestructible,
"If Undyne would take damage, instead
put a charge counter on this" and "If this has 10
charge counters on it put this into the graveyard".
You're gonna have to try harder than THAT