LEONA, The Radiant Dawn

Provoke, Daybound (If a player cast no spells
during their own turn, it becomes night next turn.)
When I transform, place a number of stun
counters on opponent's creatures up to the
number of Daybound creatures you control;
When I transform, place a number of shield
counters on target creatures you control up to
the number Daybound creatures you control.
Lose all counters and transform me back if it is
Night.