Pumpkin Swamp

Unless a creature died this turn, this land enters
the battlefield tapped.
{t}: Add {b} mana to your mana pool.
{t}, Sacrifice a Food: Add one mana of any color
in your graveyard.
{1}{b}{t}: If a card entered the graveyard this turn, create a Food token. Then, if 4 or more cards
where put into a graveyard this turn, untap
Pumpkin Swamp.