Appeal to the Abyss

At the beginning of your upkeep, you may put the top two cards of your library into your graveyard.
Delirium - {2}{b}, Sacrifice Appeal to the Abyss: Until end of turn, you may cast nonland cards from your graveyard. If a card would be put into your graveyard from anywhere this turn, exile that card instead. Activate this ability only if there are four or more card types among cards in your graveyard.