Queen of the Ashen Castle

Hexproof, Flying, protection from red
When Queen of the Ashen Castle enters the battlefield, tap all Dragons you don't control.
They don't untap during their controller's untap
step.
{2}{r}{b}{u}: Search your library or graveyard for a creature called 'Demon Dragon of Zesteria', or
reveal it in your hand, place it onto the battlefield,
then exile this card.