Aegis Turtle

Miscast

Counter target instant or sorcery spell unless its controller pays {3}.

Psychic Corrosion

Whenever you draw a card, each opponent mills two cards.

Sands of Delirium

Rapid Hybridization

Destroy target creature. It can't be regenerated. That creature's controller creates a 3/3 green Frog Lizard creature token.

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

Ancient Crab

Amphin Cutthroat

Sol Ring

Teferi's Tutelage

When Teferi's Tutelage 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.)

Fractured Sanity

Each opponent mills fourteen cards.
Cycling {1}{U} ({1}{U}, Discard this card: Draw a card.)
When you cycle Fractured Sanity, each opponent mills four cards.

Ambassador Laquatus

Drowned Secrets

Whenever you cast a blue spell, target player mills two cards.

Ruin Crab

Landfall — Whenever a land you control enters, each opponent mills three cards. (To mill a card, a player puts the top card of their library into their graveyard.)

Pongify

Destroy target creature. It can't be regenerated. Its controller creates a 3/3 green Ape creature token.

Dispel

Thought Vessel

You have no maximum hand size.
{T}: Add {C}.

Tome Scour

Counterspell

Jace's Erasure

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

Arcane Signet

{T}: Add one mana of any color in your commander's color identity.

Keening Stone

{5}, {T}: Target player mills X cards, where X is the number of cards in that player's graveyard.

Prosperity

Merfolk Mesmerist

Armored Whirl Turtle

Silver Myr

Thought Scour

Target player mills two cards.
Draw a card.

Fascination

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

Negate

Faerie Vandal

Flash (You may cast this spell any time you could cast an instant.)
Flying
Whenever you draw your second card each turn, put a +1/+1 counter on Faerie Vandal.

Archmage Emeritus

Magecraft — Whenever you cast or copy an instant or sorcery spell, draw a card.

Hedron Crab

Landfall — Whenever a land you control enters, target player mills three cards.

Didn't Say Please

Counter target spell. Its controller mills three cards.

Thran Dynamo

Ingenious Thief

Flying
When Ingenious Thief enters, look at target player's hand.

Countermand

Counter target spell. Its controller mills four cards.

Millstone

Curse of the Bloody Tome

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

Tormod's Crypt

{T}, Sacrifice Tormod's Crypt: Exile target player's graveyard.

Bay Falcon

Heartstone

Activated abilities of creatures cost {1} less to activate. This effect can't reduce the mana in that cost to less than one mana.