Sanguine Tutor

Diablerie (in addition to the casting cost you must sacrifice a non-token creature into exile and pay half of your life total. This loss of life cannot be reduced or prevented in any way)
Discard any number of cards up to the amount of life sacrificed to cast Sanguine Tutor. Then look through your library and draw that many cards plus 1.
"My tutelage comes at a heavy cost."