There are many categories of ramp, the most common of which are: Mana Rocks: Artifacts that generate mana
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Junk Tokens You can't saunter across the wastes for too long without realizingthere's just a whole lot of junk out here
Basically, we're okay with a few cards that put +1/+1 counters on creatures but we tend to avoid more complicated versions (such as 0/0 creatures that come into play with +1/+1 counters) at common, although we're more willing to do something like that if there are a number of cards dedicated to a certain theme ( Darksteel 's modular, I'm looking at you)
Point is, I feel that The Ur-Dragon, while less flavorful, is a more powerful commander for the deck than Morophon, the Boundless