Leona, Radiant Dawn

First Strike, Vigilance
Sunlight’s Mark: Whenever Leona, Radiant Dawn or another creature you control deals damage to a creature, put a sunlight counter on that creature.

Shield of Daybreak {1}{w}, {t}: Tap target creature with a sunlight counter on it. That creature doesn’t untap during its controller’s next turn.

“By the light of the Sun, the world is beheld.”