Persistent Petitioners

{1}, {T}: Target player mills a card. (They put the top card of their library into their graveyard.)
Tap four untapped Advisors you control: Target player mills twelve cards.
A deck can have any number of cards named Persistent Petitioners.

Drowner Initiate

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

Griptide

Put target creature on top of its owner's library.

Screeching Sliver

All Slivers have "{T}: Target player mills a card."

Whisk Away

Put target attacking or blocking creature on top of its owner's library.

Merfolk Mesmerist

Cathartic Adept

Fade Away

For each creature, its controller sacrifices a permanent of their choice unless they pay {1}.

Totally Lost

Put target nonland permanent on top of its owner's library.

Vedalken Dismisser

When Vedalken Dismisser enters, put target creature on top of its owner's library.

Memory Lapse

Counter target spell. If that spell is countered this way, put it on top of its owner's library instead of into that player's graveyard.

Whirlpool Whelm

Clash with an opponent, then return target creature to its owner's hand. If you win, you may put that creature on top of its owner's library instead. (Each clashing player reveals the top card of their library, then puts that card on the top or bottom. A player wins if their card had a higher mana value.)

Forced Retreat

Ghoulcaller's Bell

Sweep Away

Return target creature to its owner's hand. If that creature is attacking, you may put it on top of its owner's library instead.

Time Ebb

Wizened Snitches

Flying
Players play with the top card of their libraries revealed.

Consign to Dream

Return target permanent to its owner's hand. If that permanent is red or green, put it on top of its owner's library instead.

Deranged Assistant

{T}, Mill a card: Add {C}. (To mill a card, put the top card of your library into your graveyard.)

Jace's Erasure

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

Fall from Favor

Enchant creature
When Fall from Favor enters, tap enchanted creature and you become the monarch.
Enchanted creature doesn't untap during its controller's untap step unless that player is the monarch.

Grasp of Phantoms

Put target creature on top of its owner's library.
Flashback {7}{U} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Run Aground

Put target artifact or creature on top of its owner's library.

Winds of Rebuke

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

Rootwater Mystic

{1}{U}: Look at the top card of target player's library.

Gone Missing

Put target permanent on top of its owner's library.
Investigate. (Create a Clue token. It's an artifact with "{2}, Sacrifice this artifact: Draw a card.")