Keyword: Mill

: Each player mills a card.

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

+1: Draw a card. Target player mills a card.
0: Target player mills ten cards.
−7: Any number of target players each draw twenty cards.

Flying
Whenever a source deals damage to Belltower Sphinx, that source’s controller mills that many cards.

, : Target player mills two cards.

Flying
If Szadek, Lord of Secrets would deal combat damage to a player, instead put that many +1/+1 counters on Szadek and that player mills that many cards.

Whenever an opponent casts a spell, that player mills two cards.

Flying
Whenever another creature leaves the battlefield, you may have target player mill two cards.
Unearth (: Return this card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the next end step or if it would leave the battlefield. Unearth only as a sorcery.)

Join forces — Starting with you, each player may pay any amount of mana. Each player mills X cards, where X is the total amount of mana paid this way.

Whenever a creature attacks you or a planeswalker you control, that creature’s controller mills two cards.

As Sewer Nemesis enters, choose a player.
Sewer Nemesis’s power and toughness are each equal to the number of cards in the chosen player’s graveyard.
Whenever the chosen player casts a spell, that player mills a card.

At the beginning of each player’s upkeep, that player mills X cards, where X is the number of cards in their hand.

Target player discards a card, then mills a card.

Shriekhorn enters with three charge counters on it.
, Remove a charge counter from Shriekhorn: Target player mills two cards.

, : Target opponent loses 2 life, gets a poison counter, then mills six cards.

+2: Each player draws a card.
−1: Target player draws a card.
−10: Target player mills twenty cards.

Target player mills five cards.

Target player mills half their library, rounded down.

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

Flying
Whenever another creature leaves the battlefield, you may have target player mill two cards.
Unearth (: Return this card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the next end step or if it would leave the battlefield. Unearth only as a sorcery.)

+2: Each player draws a card.
−1: Target player draws a card.
−10: Target player mills twenty cards.

Target player mills five cards.

Target player mills half their library, rounded down.

Whenever Nemesis of Reason attacks, defending player mills ten cards.