Concentrate

Opportunity

Morphling

{U}: Untap this creature.
{U}: This creature gains flying until end of turn.
{U}: This creature gains shroud until end of turn. (It can't be the target of spells or abilities.)
{1}: This creature gets +1/-1 until end of turn.
{1}: This creature gets -1/+1 until end of turn.

Svyelunite Temple

This land enters tapped.
{T}: Add {U}.
{T}, Sacrifice this land: Add {U}{U}.

Saprazzan Skerry

This land enters tapped with two depletion counters on it.
{T}, Remove a depletion counter from this land: Add {U}{U}. If there are no depletion counters on this land, sacrifice it.

Teferi's Response

Counter target spell or ability an opponent controls that targets a land you control. If a permanent's ability is countered this way, destroy that permanent.
Draw two cards.

Mana Severance

Search your library for any number of land cards, exile them, then shuffle.

Meditate

Draw four cards. You skip your next turn.

Intuition

Search your library for three cards and reveal them. Target opponent chooses one. Put that card into your hand and the rest into your graveyard. Then shuffle.

Impulse

Look at the top four cards of your library. Put one of them into your hand and the rest on the bottom of your library in any order.

Island

City of Traitors

When you play another land, sacrifice this land.
{T}: Add {C}{C}.

Ancient Tomb

{T}: Add {C}{C}. This land deals 2 damage to you.

Blue Elemental Blast

Choose one —
• Counter target red spell.
• Destroy target red permanent.

Time Stretch

Target player takes two extra turns after this one.

Reminisce

Target player shuffles their graveyard into their library.

Show and Tell

Each player may put an artifact, creature, enchantment, or land card from their hand onto the battlefield.

Annul

Counter target artifact or enchantment spell.

Envelop

Arcanis the Omnipotent

{T}: Draw three cards.
{2}{U}{U}: Return Arcanis to its owner's hand.

Dream Halls

Rather than pay the mana cost for a spell, its controller may discard a card that shares a color with that spell.

Arcane Denial

Counter target spell. Its controller may draw up to two cards at the beginning of the next turn's upkeep.
You draw a card at the beginning of the next turn's upkeep.

Hydroblast

Choose one —
• Counter target spell if it's red.
• Destroy target permanent if it's red.