You can open an additional one as a foil, but its not common to do so
This can be extremely useful on turn-one, especially against all the combo decks that try to win as early as possible
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I pulled basic lands for Urborg, Tomb of Yawgmoth and Yavimaya, Cradle of Growth to make these more likely
The fact that they're creatures and susceptible to more types of removal means that these won't stay on the board long and won't generate much value
In a deck like Edric, Spymaster of Trest, that might care about a 1/1 flying creature, there could be a nice floor in that capacity