Heartmender 


Creature — Elemental
At the beginning of your upkeep, remove a -1/-1 counter from each creature you control.
Persist (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.)
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Cards that do something similar expected a card that isn't here?
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Harbinger of Night 98%
$31.97#14003
"At the beginning of your upkeep, put a -1/-1 counter on each creature."
Midnight Banshee 90%
$0.31#4695
"At the beginning of your upkeep, put a -1/-1 counter on each nonblack creature."
+1 more matching line
Lichenthrope 82%
$0.60#28461
"At the beginning of your upkeep, remove a -1/-1 counter from this creature."