Building of a deck

Surely someone out there who plays old school M:tG knows of this...

So I'm looking for a creature card.. who gets a +1/+1 -counter- everytime a creature comes into play.
Now I dunno if there is such a creature or not.
Scion of the Wild was a good guess from those I've already asked...
The only thing is, he's */* where * is equal to the number of creatures in play.

Bleh.