changeling cards mtg Hero [Lorwyn] You may have this creature enter as a copy of any creature on the battlefield Woodland Changeling (JA) - Foil

Considering there are only six one mana creatures that count as Dragons (Dragons + creatures with "changeling"), you might not be able to start using this super early without some additional ramp

Notably, however, there are nonbasic lands with one or more basic land types

Needing to play a bunch of creatures, needing to wait until your upkeep, and needing to pay two life to draw the card all constrict the power of Call of the Ring just a bit, but for two mana, this can easily fit into all sorts of decks

It also adds green regardless of what your creature taps for, so you can tap for green and another color if you have a Birds of Paradise