Sinister Shadows

Whenever a player discards a card, they lose life equal to the number of cards that share a type with it in their graveyard.
Delirium -- {3}{b}: Target player discards a card. Activate this ability only if there are four or more card types among cards in your graveyard.
"The shadows writhed before me, but whether it was from fatigue or malign intent I could not tell."