Hellhound Trifecta

Haste
Hellhound Trifecta enters the battlefield tapped
unless you lost 3 or more life this turn. You may
exert Hellhound Trifecta as it attacks. When you
do it gets +3/+0 and trample until end of turn.
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.)
To Hell you must proceed, retreat you won't succeed.