Shut down

At the beginning of your upkeep, if an opponent controls three or more creatures, sacrifice this enchantment, search your library for up to two creature cards, put those cards onto the battlefield, then shuffle.

When this creature enters, target opponent creates four 1/1 blue Faerie creature tokens with flying. : Regenerate this creature.

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.

Flying As Iona enters, choose a color. Your opponents can't cast spells of the chosen color.