Yawgmoth's Day Planner is a rare Artifact card from Mystery Booster 2 (MB2), collector number 555. Current market price: $0.24, TCGplayer market prices via Scryfall.
{T}, Pay 2 life: Add {B}{B}. You may cast spells from your graveyard. Only mana produced by abilities that caused you to lose life may be spent to cast spells this way. (Damage causes loss of life.) If a card would be put into your graveyard from anywhere, exile it instead.