Don't Have

Mystic Snake

Flash
When Mystic Snake enters, counter target spell.

Have

Reliquary Tower

You have no maximum hand size.
{T}: Add {C}.

Forest

Arcane Signet

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

Selesnya Guildgate

Selesnya Guildgate enters tapped.
{T}: Add {G} or {W}.

Plains

Command Tower

Snap

Return target creature to its owner's hand. Untap up to two lands.

Whitemane Lion

Flash
When Whitemane Lion enters, return a creature you control to its owner's hand.

Brokers Hideout

When Brokers Hideout enters, sacrifice it. When you do, search your library for a basic Forest, Plains, or Island card, put it onto the battlefield tapped, then shuffle and you gain 1 life.

Dream Stalker

When Dream Stalker enters, return a permanent you control to its owner's hand.

Chulane, Teller of Tales

Vigilance
Whenever you cast a creature spell, draw a card, then you may put a land card from your hand onto the battlefield.
{3}, {T}: Return target creature you control to its owner's hand.

Fellwar Stone

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

Decanter of Endless Water

You have no maximum hand size.
{T}: Add one mana of any color.

Simic Signet

Generous Gift

Destroy target permanent. Its controller creates a 3/3 green Elephant creature token.

Azorius Guildgate

Azorius Guildgate enters tapped.
{T}: Add {W} or {U}.

Selesnya Signet

Azorius Signet

Path to Exile

Exile target creature. Its controller may search their library for a basic land card, put that card onto the battlefield tapped, then shuffle.

Sol Ring

Exotic Orchard

Hullbreaker Horror

Flash
This spell can't be countered.
Whenever you cast a spell, choose up to one —
• Return target spell you don't control to its owner's hand.
• Return target nonland permanent to its owner's hand.

Simic Guildgate

Simic Guildgate enters tapped.
{T}: Add {G} or {U}.

Counterspell

Beast Within

Destroy target permanent. Its controller creates a 3/3 green Beast creature token.

Seaside Citadel

Seaside Citadel enters tapped.
{T}: Add {G}, {W}, or {U}.

Lightning Greaves

Equipped creature has haste and shroud. (It can't be the target of spells or abilities.)
Equip {0}

Swiftfoot Boots

Equipped creature has hexproof and haste. (It can't be the target of spells or abilities your opponents control.)
Equip {1}

Island

Temple of the False God

{T}: Add {C}{C}. Activate only if you control five or more lands.

Deafening Silence

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

Mana Breach

Whenever a player casts a spell, that player returns a land they control to its owner's hand.

Thought Vessel

Retreat to Kazandu

Landfall — Whenever a land you control enters, choose one —
• Put a +1/+1 counter on target creature.
• You gain 2 life.

Swords to Plowshares

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

Vivien, Champion of the Wilds

You may cast creature spells as though they had flash.
+1: Until your next turn, up to one target creature gains vigilance and reach.
−2: Look at the top three cards of your library. Exile one face down and put the rest on the bottom of your library in any order. For as long as it remains exiled, you may cast it if it's a creature spell.

Scute Swarm

Landfall — Whenever a land you control enters, create a 1/1 green Insect creature token. If you control six or more lands, create a token that's a copy of Scute Swarm instead.

Abundance

If you would draw a card, you may instead choose land or nonland and reveal cards from the top of your library until you reveal a card of the chosen kind. Put that card into your hand and put all other cards revealed this way on the bottom of your library in any order.