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

As Cloud Key enters the battlefield, choose artifact, creature, enchantment, instant, or sorcery. Spells you cast of the chosen type cost {1} less to cast.

At the beginning of your upkeep, if an opponent controls more lands than you, you may search your library for up to three basic land cards, reveal them, put them into your hand, then shuffle.

Cumulative upkeep {1} (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.) Whenever an opponent casts a noncreature spell, you may draw a card unless that player pays {4}.

Pendant of Prosperity enters the battlefield under the control of an opponent of your choice. {2}, {T}: Draw a card, then you may put a land card from your hand onto the battlefield. Pendant of Prosperity's owner draws a card, then that player may put a land card from their hand onto the battlefield.

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.")

{T}: Add {C}{C}.

Enchantment spells you cast cost {1} less to cast. Whenever an enchantment you control is put into a graveyard from the battlefield, put a +1/+1 counter on Starfield Mystic.

Search your library for an enchantment card, put it onto the battlefield, then shuffle. Epic (For the rest of the game, you can't cast spells. At the beginning of each of your upkeeps, copy this spell except for its epic ability.)

Search target opponent's library for an artifact, creature, enchantment, or land card. Put that card onto the battlefield under your control. Then that player shuffles. Epic (For the rest of the game, you can't cast spells. At the beginning of each of your upkeeps, copy this spell except for its epic ability. You may choose a new target for the copy.)

Whenever a player casts an instant or sorcery spell, each other player copies that spell. Each of those players may choose new targets for their copy.

Imprint — When Knowledge Pool enters the battlefield, each player exiles the top three cards of their library. Whenever a player casts a spell from their hand, that player exiles it. If the player does, they may cast a spell from among other cards exiled with Knowledge Pool without paying its mana cost.

Each opponent can't cast noncreature spells with mana value greater than the number of lands that player controls. Whenever an opponent casts a spell, if no mana was spent to cast it, counter that spell.

Players have no maximum hand size. At the beginning of each player's draw step, that player draws an additional card, then discards a card.

At the beginning of each player's upkeep, that player may put an artifact, creature, or land card from their hand onto the battlefield.

Flying When Charmed Griffin enters the battlefield, each other player may put an artifact or enchantment card onto the battlefield from their hand.

Flash At the beginning of each player's draw step, that player draws an additional card.

At the beginning of each player's draw step, that player draws two additional cards.

Spells cost {1} less to cast.

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

Join forces — Starting with you, each player may pay any amount of mana. Each player draws X cards, where X is the total amount of mana paid this way.

Return all artifact and enchantment cards from all graveyards to the battlefield under their owners' control. (Auras with nothing to enchant remain in graveyards.)

{T}: Add {C}. {T}: Add {W} or {U}. Adarkar Wastes deals 1 damage to you.

{T}: Add {C}. {1}, {T}: Until end of turn, creatures your opponents control lose hexproof and shroud and can't have hexproof or shroud.

Azorius Chancery enters the battlefield tapped. When Azorius Chancery enters the battlefield, return a land you control to its owner's hand. {T}: Add {W}{U}.

{T}: Add {C}. {1}, {T}: Put a storage counter on Calciform Pools. {1}, Remove X storage counters from Calciform Pools: Add X mana in any combination of {W} and/or {U}.

Castle Ardenvale enters the battlefield tapped unless you control a Plains. {T}: Add {W}. {2}{W}{W}, {T}: Create a 1/1 white Human creature token.

Castle Vantress enters the battlefield tapped unless you control an Island. {T}: Add {U}. {2}{U}{U}, {T}: Scry 2.

Celestial Colonnade enters the battlefield tapped. {T}: Add {W} or {U}. {3}{W}{U}: Until end of turn, Celestial Colonnade becomes a 4/4 white and blue Elemental creature with flying and vigilance. It's still a land.

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

{T}, Pay 1 life, Sacrifice Flooded Strand: Search your library for a Plains or Island card, put it onto the battlefield, then shuffle.

{T}: Add {C}. {2}, {T}: Each player draws a card, then discards a card.

Glacial Fortress enters the battlefield tapped unless you control a Plains or an Island. {T}: Add {W} or {U}.

Halimar Depths enters the battlefield tapped. When Halimar Depths enters the battlefield, look at the top three cards of your library, then put them back in any order. {T}: Add {U}.

{T}: Add {C}. {1}{W}, {T}: Put target enchantment card from your graveyard on top of your library.

({T}: Add {W} or {U}.) As Hallowed Fountain enters the battlefield, you may pay 2 life. If you don't, it enters the battlefield tapped.

({T}: Add {W} or {U}.) Irrigated Farmland enters the battlefield tapped. Cycling {2} ({2}, Discard this card: Draw a card.)

({T}: Add {U}.)

Lonely Sandbar enters the battlefield tapped. {T}: Add {U}. Cycling {U} ({U}, Discard this card: Draw a card.)

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

{T}: Add {C}. {2}, {T}: Each player draws a card.

{T}: Add {U}. {U}, {T}: Untap target legendary permanent.

{T}: Add {C}. {W/U}, {T}: Add {W}{W}, {W}{U}, or {U}{U}.

{T}: Add {C}. {4}, {T}: Exile target attacking creature an opponent controls. At the beginning of the next end step, return it to the battlefield tapped under its owner's control.

{T}: Add {C}. {T}: Add {W}. Activate only if you control an Island. {T}: Add {U}. Activate only if you control a Plains.

({T}: Add {W}.)

({T}: Add {W} or {U}.) Prairie Stream enters the battlefield tapped unless you control two or more basic lands.

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

Remote Isle enters the battlefield tapped. {T}: Add {U}. Cycling {2} ({2}, Discard this card: Draw a card.)

Sea of Clouds enters the battlefield tapped unless you have two or more opponents. {T}: Add {W} or {U}.

Seachrome Coast enters the battlefield tapped unless you control two or fewer other lands. {T}: Add {W} or {U}.

Secluded Steppe enters the battlefield tapped. {T}: Add {W}. Cycling {W} ({W}, Discard this card: Draw a card.)

Sejiri Refuge enters the battlefield tapped. When Sejiri Refuge enters the battlefield, you gain 1 life. {T}: Add {W} or {U}.

{1}, {T}: Add {W}{U}.

Temple of Enlightenment enters the battlefield tapped. When Temple of Enlightenment enters the battlefield, scry 1. {T}: Add {W} or {U}.

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

Thriving Heath enters the battlefield tapped. As Thriving Heath enters the battlefield, choose a color other than white. {T}: Add {W} or one mana of the chosen color.

Thriving Isle enters the battlefield tapped. As Thriving Isle enters the battlefield, choose a color other than blue. {T}: Add {U} or one mana of the chosen color.

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

Flying, lifelink Pegasus creatures you control have lifelink. Constellation — Whenever an enchantment enters the battlefield under your control, create a 2/2 white Pegasus creature token with flying.

Creatures can't attack you unless their controller pays {2} for each creature they control that's attacking you.

Flying Other creatures have base power and toughness 1/1.

Other enchantments you control have shroud. (A permanent with shroud can't be the target of spells or abilities.) Enchanted creatures you control have shroud.

Flying Non-Archon creatures have base power and toughness 3/3. When Harmonious Archon enters the battlefield, create two 1/1 white Human creature tokens.

If you would draw a card during your draw step, instead you may skip that draw. If you do, until your next turn, you can't be attacked except by creatures with flying and/or islandwalk.

You may exile a blue card from your hand rather than pay this spell's mana cost. Change the target of target spell with a single target.

When Mystic Barrier enters the battlefield or at the beginning of your upkeep, choose left or right. Each player may attack only the nearest opponent in the last chosen direction and planeswalkers controlled by that opponent.

Creatures can't attack you unless their controller pays {2} for each creature they control that's attacking you.

Constellation — Whenever an enchantment enters the battlefield under your control, you may have Protean Thaumaturge become a copy of another target creature, except it has this ability.

You may choose new targets for target spell.

Creatures can't attack you or planeswalkers you control unless their controller pays {X} for each of those creatures, where X is the number of enchantments you control.

Until your next turn, your life total can't change and you gain protection from everything. All permanents you control phase out. (While they're phased out, they're treated as though they don't exist. They phase in before you untap during your untap step.) Exile Teferi's Protection.

Put all creatures on the bottom of their owners' libraries. Miracle {W} (You may cast this card for its miracle cost when you draw it if it's the first card you drew this turn.)

Search your library for an artifact or enchantment card, reveal it, then shuffle and put that card on top.

Search your library for an artifact card, reveal it, put it into your hand, then shuffle.

When Act of Authority enters the battlefield, you may exile target artifact or enchantment. At the beginning of your upkeep, you may exile target artifact or enchantment. If you do, its controller gains control of Act of Authority.

At the beginning of your upkeep, you may exchange control of Conjured Currency and target permanent you neither own nor control.

({W/U} can be paid with either {W} or {U}.) Whenever a player casts a noncreature spell, counter that spell. That player creates X 1/1 white and blue Bird creature tokens with flying, where X is the spell's mana value.

At the beginning of your upkeep, for each land target player controls in excess of the number you control, choose a land that player controls, then the chosen permanents phase out. Repeat this process for artifacts and creatures. (While they're phased out, they're treated as though they don't exist. They phase in before that player untaps during their next untap step.)

At the beginning of each opponent's upkeep, that player chooses draw step, main phase, or combat phase. The player skips each instance of the chosen step or phase this turn.

Whenever an opponent casts a spell, that player draws seven cards.

Whenever a player casts a spell, any other player may pay that spell's mana cost. If a player does, counter the spell. (Mana cost includes color.)

Players can't cast spells that share a color with the spell most recently cast this turn.

Whenever an opponent casts their first spell each turn, that player exiles the top card of their library. If it's a nonland card, you may cast it without paying its mana cost.

At the beginning of each player's upkeep, return to its owner's hand each creature that player controls with power greater than the number of cards in their hand.

Whenever a player chooses one or more targets, each player reveals the top card of their library. The player who reveals the card with the highest mana value may change the target or targets. If two or more cards are tied for highest, the target or targets remain unchanged. Changing targets this way doesn't trigger abilities of permanents named Psychic Battle.

If a player would draw a card, that player exiles the top card of one of their opponents' libraries face down instead. Each player may look at cards they exiled with Shared Fate, and they may play lands and cast spells from among those cards.

When a player casts a spell, sacrifice Standstill. If you do, each of that player's opponents draws three cards.

At the beginning of each player's draw step, that player puts the cards in their hand on the bottom of their library in any order, then draws that many cards.

At the beginning of each player's upkeep, that player chooses artifact, creature, land, or non-Aura enchantment. All nontoken permanents of that type phase out. (While they're phased out, they're treated as though they don't exist. Each one phases in before its controller untaps during their next untap step.)

At the beginning of each upkeep, each player exiles the top card of their library. The player who exiled the card with the highest mana value takes an extra turn after this one. If two or more players' cards are tied for highest, the tied players repeat this process until the tie is broken.

Aeon Engine enters the battlefield tapped. {T}, Exile Aeon Engine: Reverse the game's turn order. (For example, if play had proceeded clockwise around the table, it now goes counterclockwise.)

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

Flying As Archangel of Strife enters the battlefield, each player chooses war or peace. Creatures controlled by players who chose war get +3/+0. Creatures controlled by players who chose peace get +0/+3.

Exile all permanents. For as long as any of those cards remain exiled, at the beginning of each player's upkeep, that player returns one of the exiled cards they own to the battlefield.

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

Players skip their upkeep steps.

At the beginning of your upkeep, put a time counter on Infinite Hourglass. All creatures get +1/+0 for each time counter on Infinite Hourglass. {3}: Remove a time counter from Infinite Hourglass. Any player may activate this ability but only during any upkeep step.

Discard a card: You may tap or untap target artifact, creature, or land.

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