Derrek, The Administrator

Every time a card is put into an opponent's graveyard, they take 1 damage.
{x}: Target opponent reveals {x} cards from the top of their library and places them in the graveyard, where {x} is the amount of {u} paid.
{b}{b}{t}: Sacrifice a creature OR destroy target creature and sacrifice Derrek, the Administrator. All other Finks take no damage this turn.