High Tide

Until end of turn, whenever a player taps an Island for mana, that player adds an additional {U}.

Drannith Magistrate

Your opponents can't cast spells from anywhere other than their hands.

Negate

Eidolon of Rhetoric

Each player can't cast more than one spell each turn.

Kwain, Itinerant Meddler

{T}: Each player may draw a card, then each player who drew a card this way gains 1 life.

Azorius Signet

Laboratory Maniac

If you would draw a card while your library has no cards in it, you win the game instead.

Aura of Silence

Artifact and enchantment spells your opponents cast cost {2} more to cast.
Sacrifice Aura of Silence: Destroy target artifact or enchantment.

Disenchant

Temple Bell

Arcane Laboratory

Archon of Emeria

Flying
Each player can't cast more than one spell each turn.
Nonbasic lands your opponents control enter tapped.

Arcane Signet

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

Dovin's Veto

This spell can't be countered.
Counter target noncreature spell.

Fellwar Stone

{T}: Add one mana of any color that a land an opponent controls could produce.

Howling Mine

At the beginning of each player's draw step, if Howling Mine is untapped, that player draws an additional card.

Swords to Plowshares

Exile target creature. Its controller gains life equal to its power.

Render Silent

Counter target spell. Its controller can't cast spells this turn.

Rule of Law

Blind Obedience

Extort (Whenever you cast a spell, you may pay {W/B}. If you do, each opponent loses 1 life and you gain that much life.)
Artifacts and creatures your opponents control enter tapped.

Smothering Tithe

Whenever an opponent draws a card, that player may pay {2}. If the player doesn't, you create a Treasure token. (It's an artifact with "{T}, Sacrifice this artifact: Add one mana of any color.")

Linvala, Keeper of Silence

Flying
Activated abilities of creatures your opponents control can't be activated.

Winds of Rebuke

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

Swan Song

Counter target enchantment, instant, or sorcery spell. Its controller creates a 2/2 blue Bird creature token with flying.