Hasan, Astral Knight

Eminence —Whenever a creature an opponent controls becomes tapped, if Hasan Astral Knight
is in the command zone or on the battlefield, you
may pay {w/u}{b}. If you do, that creature doesn't
untap during its controller's next untap step.
First Strike, Vigilance, Protection from Zombies
Hasan, Astral Knight can block any number of creatures.