Sediki, the Wasteless

Sediki, the Wasteless has hexproof as long as
there are four or more creature cards in exile.
Whenever a creature an opponent controls dies,
that opponent may pay {3}. If they do, exile that
creature instead.
{1}{b}{g}: Exile target creature card you don't own
from a graveyard. That card's owner loses life
equal to the number of creature cards in exile and
you gain that much life.