Sorcha, Dream Eater

+1: Create two 0/1 blue and black Harmless Harpy creature tokens with flying.
-1: Fateseal and Surveil X, where X is the number of Harmless Harpies you control.
-7: You get an emblem that reads: "Creatures you control get +2/+0. Creatures you don't control get -2/-0."