Skeleton Scavengers 

Creature — Skeleton
This creature enters with a +1/+1 counter on it.
Pay {1} for each +1/+1 counter on this creature: Regenerate this creature. When it regenerates this way, put 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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Embodiment of Agonies 89%
$0.38#15605
"This creature enters with a +1/+1 counter on it for each different mana cost among nonland cards in your graveyard."
Scaleguard Sentinels 83%
$0.10#28538
"This creature enters with a +1/+1 counter on it if you revealed a Dragon card or controlled a Dragon as you cast this spell."