Bolster the Ranks

Zombie Creatures you control have Undying
(When this creature is put into a graveyard
from the battlefield, 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.)
"You've returned already? Get out there and put
your back into it... okay, bad choice of words"
- Aishling Antonomasia