Forbidden Grimoire

Whenever an opponent searches their library for
the first time each turn you may pay {1}{b}, if you
do, search your library for a card, reveal it, then
shuffle your library and put that card on top of
it. You lose life equal to that card's converted
mana cost.
"Ahlih is our greatest and most dangerous ally.
She has embraced and mastered forbidden magic.
Provoking her would be disastrous and foolish."
-Yggdris, the Wise Elder