Unsummon

Return target creature to its owner's hand.

Drowned Secrets

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

Memory Erosion

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

Essence Scatter

Thought Scour

Target player mills two cards.
Draw a card.

Fraying Sanity

Enchant player
At the beginning of each end step, enchanted player mills X cards, where X is the number of cards put into their graveyard from anywhere this turn.

Counterspell

Blink of an Eye

Kicker {1}{U} (You may pay an additional {1}{U} as you cast this spell.)
Return target nonland permanent to its owner's hand. If this spell was kicked, draw a card.

Psychic Corrosion

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

Tome Scour

Visions of Beyond

Draw a card. If a graveyard has twenty or more cards in it, draw three cards instead.

River's Rebuke

Return all nonland permanents target player controls to their owner's hand.

Brainstorm

Draw three cards, then put two cards from your hand on top of your library in any order.

Negate

Memorial to Genius

Memorial to Genius enters tapped.
{T}: Add {U}.
{4}{U}, {T}, Sacrifice Memorial to Genius: Draw two cards.

Ipnu Rivulet

{T}: Add {C}.
{T}, Pay 1 life: Add {U}.
{1}{U}, {T}, Sacrifice a Desert: Target player mills four cards. (They put the top four cards of their library into their graveyard.)

Patient Rebuilding

At the beginning of your upkeep, target opponent mills three cards, then you draw a card for each land card put into their graveyard this way.

Island

Jace's Phantasm

Flying
Jace's Phantasm gets +4/+4 as long as an opponent has ten or more cards in their graveyard.

Sleep

Tap all creatures target player controls. Those creatures don't untap during that player's next untap step.