Ganett, Grand Adjudicator

Flying, vigilance

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.)

Whenever Ganett, Grand Adjudicator attacks, detain target creature an opponent controls. If you extorted
this turn, detain two creatures instead. (Until your
next turn, those creatures can't attack or block and
their activated abilities can't be activated.)