Necrogoyf is a rare Creature — Lhurgoyf card from Magic Online Promos (PRM), collector number 91259.
Necrogoyf's power is equal to the number of creature cards in all graveyards. At the beginning of each player's upkeep, that player discards a card. Madness {1}{B}{B} (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)