Sour Nothings

Delve (Each card you exile from your graveyard while casting this spell pays for {1}.)
Shelve (Each card in exile you own that you shuffle into your library as you cast this pays for {1}).
Look at each other player's hand. You may choose up to X cards from each. Then, those players discard those cards. X is equal to the number of cards shelved to Sour Nothings.