Have

Jace's Erasure

Whenever you draw a card, you may have target player mill a card.

Counterspell

Chronic Flooding

Enchant land
Whenever enchanted land becomes tapped, its controller mills three cards.

Curse of the Bloody Tome

Enchant player
At the beginning of enchanted player's upkeep, that player mills two cards.

Countermand

Counter target spell. Its controller mills four cards.

Compelling Argument

Target player mills five cards.
Cycling {U} ({U}, Discard this card: Draw a card.)

Tome Scour

Thought Scour

Target player mills two cards.
Draw a card.

Echoing Truth

Return target nonland permanent and all other permanents with the same name as that permanent to their owners' hands.

Homarid Explorer

When Homarid Explorer enters, target player mills four cards.

Island

Merfolk Mesmerist

Mind Sculpt

Memory Sluice

Target player mills four cards.
Conspire (As you cast this spell, you may tap two untapped creatures you control that share a color with it. When you do, copy it and you may choose a new target for the copy.)

Brainstorm

Draw three cards, then put two cards from your hand on top of your library in any order.

Mulldrifter

Flying
When Mulldrifter enters, draw two cards.
Evoke {2}{U} (You may cast this spell for its evoke cost. If you do, it's sacrificed when it enters.)