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

{3}, {T} or {U}, {T}: Return target creature to its owner's hand unless its controller pays {1}.

{T}: Target permanent becomes the color of your choice until end of turn.

{3}, {T}: Target player mills two cards. If two cards that share a color were milled this way, repeat this process.

{T}: Add {C}. {1}, {T}, Sacrifice Mind Stone: Draw a card.

Blue spells you cast cost {1} less to cast.

Sky Diamond enters the battlefield tapped. {T}: Add {U}.

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

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

{1}{U}: Target spell or permanent becomes the color of your choice until end of turn.

Flying, protection from green

Soulbond (You may pair this creature with another unpaired creature when either enters the battlefield. They remain paired for as long as you control both of them.) As long as Deadeye Navigator is paired with another creature, each of those creatures has "{1}{U}: Exile this creature, then return it to the battlefield under your control."

{1}{U}: Return target artifact you control to its owner's hand. {3}, {T}: Copy target artifact spell you control. (The copy becomes a token.)

Flying Fylamarid can't be blocked by blue creatures. {U}: Target creature becomes blue until end of turn.

Flying {U}: Target permanent becomes blue in addition to its other colors until end of turn.

Flying Metathran Transport can't be blocked by blue creatures. {U}: Target creature becomes blue until end of turn.

Flying When Peregrine Drake enters the battlefield, untap up to five lands.

{T}: Add one mana of any color. {T}: Target creature becomes the color or colors of your choice until end of turn.

Flying, protection from red

Whenever you cast an instant or sorcery spell, create a 2/2 blue Drake creature token with flying.

When Thassa's Oracle enters the battlefield, look at the top X cards of your library, where X is your devotion to blue. Put up to one of them on top of your library and the rest on the bottom of your library in a random order. If X is greater than or equal to the number of cards in your library, you win the game. (Each {U} in the mana costs of permanents you control counts toward your devotion to blue.)

Indestructible As long as your devotion to blue is less than five, Thassa isn't a creature. At the beginning of your end step, exile up to one other target creature you control, then return that card to the battlefield under your control. {3}{U}: Tap another target creature.

{T}: Target creature becomes the color of your choice until end of turn.

{T}: Target instant or sorcery spell becomes the color of your choice.

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

Nonbasic lands don't untap during their controllers' untap steps.

Red spells cost {2} more to cast.

Whenever a creature becomes the target of a spell or ability, return that creature to its owner's hand. (It won't be affected by the spell or ability.)

{1}{U}: Counter target red spell.

Creatures don't untap during their controllers' untap steps. At the beginning of each player's upkeep, that player may choose any number of tapped nongreen creatures they control and pay {2} for each creature chosen this way. If the player does, untap those creatures.

Red creature spells and green creature spells cost {1} more to cast.

Whenever an opponent casts a green spell, you draw a card.

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

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}.

Whenever an opponent casts a spell, you may draw a card unless that player pays {1}.

As Shifting Sky enters the battlefield, choose a color. All nonland permanents are the chosen color.

As Swirl the Mists enters the battlefield, choose a color word. All instances of color words in the text of spells and permanents are changed to the chosen color word.

Prevent all damage that would be dealt to a creature by another creature if they share a color.

Change the text of target spell or permanent by replacing all instances of one color word with another. (This effect lasts indefinitely.) Flashback {1}{U} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

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

Target player mills three cards. Storm (When you cast this spell, copy it for each spell cast before it this turn. You may choose new targets for the copies.)

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

Buyback {3} (You may pay an additional {3} as you cast this spell. If you do, put this card into your hand as it resolves.) Return target permanent to its owner's hand.

Counter target spell.

Choose one — • Destroy target red permanent. • Return target Mountain to its owner's hand.

Counter target blue spell.

Return all green permanents to their owners' hands.

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

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

Counter target spell if it shares a color with a creature you control.

Search your library for a card, then shuffle and put that card third from the top.

Counter target spell unless its controller pays {3}.

Change the text of target permanent by replacing all instances of one color word with another or one basic land type with another. (For example, you may change "nonblack creature" to "nongreen creature" or "forestwalk" to "islandwalk." This effect lasts indefinitely.)

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

Return target permanent you control to its owner's hand.

Tap all blue creatures.

Change the text of target spell or permanent by replacing all instances of one color word with another. (For example, you may change "target black spell" to "target blue spell." This effect lasts indefinitely.)

Any number of target creatures become the color of your choice until end of turn. Draw a card.

({T}: Add {U}.)

({T}: Add {U}.) Mystic Sanctuary enters the battlefield tapped unless you control three or more other Islands. When Mystic Sanctuary enters the battlefield untapped, you may put target instant or sorcery card from your graveyard on top of your library.

Search your library for a blue instant card, reveal that card, put it into your hand, then shuffle.

Scry 2, then draw a card. (To scry 2, look at the top two cards of your library, then put any number of them on the bottom and the rest on top in any order.)

Return target permanent to its owner's hand if that permanent shares a color with the most common color among all permanents or a color tied for most common.

Change the text of target spell or permanent by replacing all instances of one color word with another or one basic land type with another until end of turn. Draw a card.

Change the text of target spell or permanent by replacing all instances of one color word with another. Retrace (You may cast this card from your graveyard by discarding a land card in addition to paying its other costs.)

Flying Creatures you control have "Whenever this creature becomes the target of a spell or ability for the first time each turn, counter that spell or ability."

As Painter's Servant enters the battlefield, choose a color. All cards that aren't on the battlefield, spells, and permanents are the chosen color in addition to their other colors.

Choose target spell or permanent that's red or green. Its owner puts it on the top or bottom of their library.

When Archaeomancer enters the battlefield, return target instant or sorcery card from your graveyard to your hand.

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.

Flying Protection from red (This creature can't be blocked, targeted, dealt damage, enchanted, or equipped by anything red.) Sacrifice Cerulean Drake: Counter target spell that targets you.

Target creature becomes blue until end of turn. Untap that creature. Draw a card.

At the beginning of your upkeep, if you control a red or green permanent, draw a card, then discard a card. If you control a red permanent and a green permanent, instead draw two cards, then discard a card.

Return target permanent to its owner's hand. If that permanent is red or green, put it on top of its owner's library instead.

Flying As an additional cost to cast blue permanent spells, you may pay 2 life. Those spells cost {U} less to cast if you paid life this way. This effect reduces only the amount of blue mana you pay. Whenever you cast a blue permanent spell, draw a card.

Each creature your opponents control is an Illusion in addition to its other types and has "When this creature becomes the target of a spell or ability, sacrifice it."

Untap all nonland permanents you control.

{2}{U}: Return target white or black creature you control to its owner's hand.

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

Counter target red or green spell.

Exile two target artifacts, creatures, and/or lands you control, then return those cards to the battlefield under your control.

Gain control of target monocolored creature. Forecast — {1}{U}, Reveal Govern the Guildless from your hand: Target creature becomes the color or colors of your choice until end of turn. (Activate only during your upkeep and only once each turn.)

Other blue creatures you control get +1/+1. {U}: Target artifact creature becomes blue until end of turn. Tap an untapped blue creature you control: Add {C}{C}. Spend this mana only to cast artifact spells or activate abilities of artifacts.

{U}: Tap target green creature.

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.

Counter target blue spell. If it was a Jace planeswalker spell, scry 2.

Blue creature spells you cast cost {1} less to cast. Whenever you cast a creature spell, target creature an opponent controls doesn't untap during its controller's next untap step.

{1}{U}, {T}: Put target green creature on top of its owner's library.

Protection from red Elemental creatures you control get +1/+1. When Master of Waves enters the battlefield, create a number of 1/0 blue Elemental creature tokens equal to your devotion to blue. (Each {U} in the mana costs of permanents you control counts toward your devotion to blue.)

Counter target instant or sorcery spell. Transmute {1}{U}{U} ({1}{U}{U}, Discard this card: Search your library for a card with the same mana value as this card, reveal it, put it into your hand, then shuffle. Transmute only as a sorcery.)

Equipped creature has shroud. (It can't be the target of spells or abilities.) {U}{U}: Attach Neurok Stealthsuit to target creature you control. Equip {1} ({1}: Attach to target creature you control. Equip only as a sorcery.)

Other blue creatures you control get +1/+1. {U}, {T}: Another target blue creature you control gains flying until end of turn.

Flying {2}, {Q}: Add one mana of any color. ({Q} is the untap symbol.)

Look at the top three cards of your library, then put them back in any order. You may shuffle. Draw a card.

Destroy target creature. It can't be regenerated. Its controller creates a 3/3 green Ape creature token.

Exile target artifact or creature. Its controller creates a 4/4 blue and red Elemental creature token.

{T}: Add {C}. {4}, {T}: Target creature can't be blocked this turn.

Search your library for an instant or sorcery card, reveal it, put it into your hand, then shuffle.

Choose one — • Change the text of target spell or permanent by replacing all instances of one basic land type with another. (This effect lasts indefinitely.) • Change the text of target spell or permanent by replacing all instances of one color word with another. (This effect lasts indefinitely.) Entwine {2} (Choose both if you pay the entwine cost.)

When Spellseeker enters the battlefield, you may search your library for an instant or sorcery card with mana value 2 or less, reveal it, put it into your hand, then shuffle.

Islandwalk (This creature can't be blocked as long as defending player controls an Island.) All lands are Islands in addition to their other types. Creatures without flying or islandwalk can't attack.

Surge Mare can't be blocked by green creatures. Whenever Surge Mare deals damage to an opponent, you may draw a card. If you do, discard a card. {1}{U}: Surge Mare gets +2/-2 until end of turn.

Exile target creature and put two time counters on it. If it doesn't have suspend, it gains suspend. (At the beginning of its owner's upkeep, they remove a time counter. When the last is removed, they may play it without paying its mana cost. If it's a creature, it has haste.)

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

When Tidebinder Mage enters the battlefield, tap target red or green creature an opponent controls. That creature doesn't untap during its controller's untap step for as long as you control Tidebinder Mage.

Change the text of target permanent by replacing all instances of one color word with another or one basic land type with another until end of turn. Cipher (Then you may exile this spell card encoded on a creature you control. Whenever that creature deals combat damage to a player, its controller may cast a copy of the encoded card without paying its mana cost.)

When Tribute Mage enters the battlefield, you may search your library for an artifact card with mana value 2, reveal that card, put it into your hand, then shuffle.

When Trinket Mage enters the battlefield, you may search your library for an artifact card with mana value 1 or less, reveal that card, put it into your hand, then shuffle.

Whenever you cast a spell, creatures you control can't be the targets of spells or abilities your opponents control this turn.