Oa, Cryptic Metamagician

+1: Up to one target creature gets -1/+1 until your next turn. Scry 1.
0: Until your next turn, you may tap Oa as though she were an artifact creature to pay the costs of spells you cast with convoke or improvise.
-2: You get an emblem with "Spells you cast are kicked, overloaded, entwined, and surged, and five colours of mana were used to cast them."