Rhythm, Sunshine Queen

At the beginning of your end step, if you cast the same amount of spells in your second main phase as you did in your first main phase, scry 5 and put a +1/+1 counter on Rhythm.
Partner with Rhyme, Moonlit Empress (When this creature enters the battlefield, target player may put Rhyme, Moonlit Empress into their hand from their library, then shuffle.)