Oculus Regis, Revelation

Eminence — if Oculus Regis, Revelation is in the command zone or on the battlefield, if X or the
amount of demons and horrors on the battlefield
is equal to or higher than the amount of cards in
an opponents hand, he or she must play with his
or her hand revealed to you.
{t}: Target player shuffles target card into their
deck. As an additional cost, you may tap a demon
or horror. If you do, {ut} Oculus Regis, Revelation.