Nistaket, God of Liberty

Flying
At the beginning of your upkeep, if an opponent controls 3 or more creatures, put a worship
counter on this card.
{2}{w}{u}, {t}: Detain each permanent your
opponents control with converted mana cost X
or less, where X is the number of worship counters
on this card.
If they card would be destroyed, put it on top of
its owners library instead.
"You are under my domain now. Obey".