Thirst for Knowledge

Draw three cards. Then discard two cards unless you discard an artifact card.

Plains

Mire Triton

Deathtouch
When this creature enters, mill two cards and you gain 2 life. (To mill a card, put the top card of your library into your graveyard.)

Planar Birth

Return all basic land cards from all graveyards to the battlefield tapped under their owners' control.

Dream Twist

Target player mills three cards.
Flashback {1}{U} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Frantic Search

Draw two cards, then discard two cards. Untap up to three lands.

Island

Thought Scour

Target player mills two cards.
Draw a card.

Swamp

Crow of Dark Tidings

Flying
When this creature enters or dies, mill two cards. (Put the top two cards of your library into your graveyard.)

Ideas Unbound

Draw three cards. Discard three cards at the beginning of the next end step.

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.)