Delirious Visions

A deck may have any number of cards named Delirious Visions.
Target player loses 2 life and discards a card.
Delirium: At the beginning of each end step, if there are 4 or more card types among cards in your graveyard, you may pay {3}{u}{b}. If you do, exile three cards named Deilirous Visions from your graveyard, then return one of them to the battlefield transformed.