Occult Ritual of Durkwood

If a nonland card would be put into any player's graveyard from the battlefield, exile it instead.
Sacrifice another nonland permanent: Until your
next turn, the next black spell and the next green
spell you cast can't be countered and cost up to
one mana of any color less to cast for each card a
player owns into exile. Activate this ability only
as a sorcery and only once per turn.