Urithel, Shadow of the Gods

Flying, Vigilance
In the Shadows - If Urithel would leave the battlefield, you may instead tap it and keep it on
the battlefield. This effect can only occur once
every turn.
{x}{2}{b}{b}: Target opponent reveals cards from
the top of their deck until they have revealed X
non-land permanents. You may cast those cards without paying their cost as long as they cost less
than X