I think this guy should be mono-green. The Fallow Earth effect is very green. Temporal Spring was blue because it let you hit other permanents as well, a la Time Ebb.
With the non-basic restriction, I can easily see this card at
1GG,

, or

, and possibly a 2/1, 1/2, or 2/2.
Edit: No fair playing this guy turn 2 off a Birds.