Kristin, Artful Geomancer

+1: Target land you control becomes a X/X creature with "This creature's power and toughness are equal to the number of loyalty counters on Kristin."
-1: Each land creature you control gets +1/+1 and gains vigilance and trample until your next turn.
-3: You get an emblem with "Creatures you control get +1/+1."