Belltower Sphinx

Flying
Whenever a source deals damage to this creature, that source's controller mills that many cards.

Winds of Rebuke

Return target nonland permanent to its owner's hand. Each player mills two cards.

Vantress Gargoyle

Flying
This creature can't attack unless defending player has seven or more cards in their graveyard.
This creature can't block unless you have four or more cards in hand.
{T}: Each player mills a card.

Venture Deeper

Target player mills four cards. (Then exile this card. You may cast the creature later from exile.)

Merfolk Secretkeeper

Merfolk Secretkeeper // Venture Deeper

Navigator's Ruin

Raid — At the beginning of your end step, if you attacked this turn, target opponent mills four cards.

Sea Scryer

Selhoff Occultist

Whenever this creature or another creature dies, target player mills a card.

Apprentice Wizard

Ray of Erasure

Target player mills a card.
Draw a card at the beginning of the next turn's upkeep.

Chill of Foreboding

Each player mills five cards.
Flashback {7}{U} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Merfolk Windrobber

Flying
Whenever this creature deals combat damage to a player, that player mills a card. (They put the top card of their library into their graveyard.)
Sacrifice this creature: Draw a card. Activate only if an opponent has eight or more cards in their graveyard.

Didn't Say Please

Counter target spell. Its controller mills three cards.

Thought Collapse

Mindscour Dragon

Flying
Whenever this creature deals combat damage to an opponent, target player mills four cards.

Drowner Initiate

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

Silver Myr

Bond of Insight

Each player mills four cards. Return up to two instant and/or sorcery cards from your graveyard to your hand. Exile Bond of Insight.

Merfolk Mesmerist

Stream of Thought

Target player mills four cards. You shuffle up to four cards from your graveyard into your library.
Replicate {2}{U}{U} (When you cast this spell, copy it for each time you paid its replicate cost. You may choose new targets for the copies.)

Fascination

Choose one —
• Each player draws X cards.
• Each player mills X cards.

Shriekgeist

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

Jace's Erasure

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

Ambassador Laquatus

Teferi's Tutelage

When this enchantment enters, draw a card, then discard a card.
Whenever you draw a card, target opponent mills two cards. (They put the top two cards of their library into their graveyard.)