As an additional cost to cast this spell, sacrifice a creature. Add X mana in any combination of {B} and/or {R}, where X is the sacrificed creature's mana value.
"My foes serve me twice: in dying, and in death." —Lim-Dûl, the Necromancer
{3}, {T}: Until end of turn, you may cast instant and sorcery spells from the top of your graveyard. If a spell cast this way would be put into a graveyard, exile it instead.
Threshold — {1}{B}, {T}, Exile two cards from your graveyard: Target player discards a card. Activate only as a sorcery and only if seven or more cards are in your graveyard.
{2}{B}, Sacrifice a creature: Target creature gets -2/-2 until end of turn. {2}{B}, Exile a creature card from your graveyard: Target creature gets -2/-2 until end of turn.
{T}: Add {B}. This land deals 1 damage to you. Threshold — {B}, {T}, Sacrifice this land: Target creature gets -2/-2 until end of turn. Activate only if seven or more cards are in your graveyard.