Typhus, Herald of Nurgle

Deathtouch
Boast—{1}{b}: Target player searches their library for a card, then shuffles their library
and puts that card on top of it. (Activate this ability only if this creature attacked this turn and only once each turn)
"Look upon me and know that I can slay you at will. You have no defence save one: to look into the darkness at the back of your own mind. There, you will find Father Nurgle waiting to offer you life in return for your submission. Deny him, and you are mine."