Syndic of Extraction

Extort (Whenever you cast a spell, you may pay {w/b}. If you do, each opponent loses 1 life and you
gain that much life.)
At the beginning of each end step, if you paid
for an extort ability this turn, you may search
your library for a card with mana value X or
less, where X is the number of times you paid
for extort abilities this turn, reveal it, then
shuffle and put that card on top.