Yume-Meng, The Wisher

Flying, vigilance, hexproof
Prowess
Yume-Meng, The Wisher enters the battlefield
with three ki counters, whenever you cast a non-creature spell, put a ki counter on Yume-Meng.
{1}{u/r}, Remove a ki counter, {t}: Exile the top two
cards of your library, you may cast one non-
creature spell without paying its cost.