Benighted

Benighted has shroud. Enchant permanent.
Enchanted permanent loses all abilities and taps
& may not untap except by this effect during that
players upkeep: Controller of enchanted
permanent reveals the top card of their library.
If revealed card has the same mana cost (including
color) of the enchanted permanent, destroy
Benighted and untap enchanted permanent.
If not, remove the revealed card from the game.
"Atone with your lonely soul."