Erayo\\\'s Maze

Players can't cast spells that share a color with the spell most recently cast this turn.

Flying Whenever the fourth spell of a turn is cast, flip Erayo.

Whenever an opponent casts their first spell each turn, counter that spell.

As this creature enters, choose a color. All cards that aren't on the battlefield, spells, and permanents are the chosen color in addition to their other colors.