Frostbrood Skytalon

Flying, deathtouch, trample
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.)
When Frostbrood Skytalon attacks, if that player
has a Plague token attached to them, Frostbrood Skytalon deals damage equal to its power to each creature and planeswalker that player controls.