Northwind Frostmaiden

Coven (This creature gets +1/+1 and has hexproof as
long as you control two or more other creatures that
share a creature type with it.)
Whenever you cast an instant or sorcery spell, or
a creature with coven enters the battlefield under
your control, tap target creature an opponent
controls. It doesn't untap during its controller's
next untap step.
"Mortals, tremble at the breath of winter."