Lunala, Light Devourer

Lifelink, flying
Whenever Lunala, Light Devourer enters the battlefield, it becomes night.
Moongeist Beam—{2}{b}{b}: You can tap any
number of white permanent or plains you control. Lunala deals 5 damage plus 1 for each of those permanent to target creature. If it's night, excess damage it's dealt to that creature's controller
instead.