Aquaeductus Mesencephali

Delve (Each card you exile from your graveyard while casting this spell pays for {1}.)

Surveil 3. (Look at the top three cards of your library, then put any number of them into your graveyard and the rest
on the top of your library in any order.)

Discover 4. (Exile cards from the top of your library until you exile a nonland card with mana value 4 or less. Cast it without paying its mana cost or put it into your hand. Put the rest on the bottom in a random order.)

Draw two cards.