Thought Scour

Target player mills two cards.
Draw a card.

Dream Twist

Target player mills three cards.
Flashback {1}{U} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Counterspell

Augur of Bolas

When Augur of Bolas enters, look at the top three cards of your library. You may reveal an instant or sorcery card from among them and put it into your hand. Put the rest on the bottom of your library in any order.

Wight of Precinct Six

Wight of Precinct Six gets +1/+1 for each creature card in your opponents' graveyards.

Gurmag Angler

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

Shriekgeist

Flying
Whenever Shriekgeist deals combat damage to a player, that player mills two cards.

Cast Down

Mind Sculpt

Drowner Initiate

Whenever a player casts a blue spell, you may pay {1}. If you do, target player mills two cards.