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

Whenever a nonartifact permanent you control enters, you may return another permanent you control that shares a permanent type with it to its owner's hand.

Nonartifact spells you cast have improvise. (Your artifacts can help cast those spells. Each artifact you tap after you're done activating mana abilities pays for {1}.)

Sacrifice an artifact: Add {C}{C}.

If an artifact or creature entering causes a triggered ability of a permanent you control to trigger, that ability triggers an additional time.

{T}: Add {C}. {T}: Add {G} or {U}. This artifact deals 1 damage to you.

If you would create a Clue, Food, or Treasure token, instead create one of each.

Ward {2} (Whenever this creature becomes the target of a spell or ability an opponent controls, counter it unless that player pays {2}.) If one or more tokens would be created under your control, twice that many of those tokens are created instead.

When this creature enters, choose one — • Create a 1/1 white Bird creature token with flying. • Return another target nonland permanent to its owner's hand. • Draw a card.

Flying {T}: Add one mana of any color.

{T}, Tap an untapped artifact or creature you control: Add one mana of any color.

Vigilance Whenever Clement or another creature you control enters, return up to one target creature you control with lesser mana value to its owner's hand. Frogs you control have "{T}: Add {G} or {U}. Spend this mana only to cast a creature spell."

When this creature enters, reveal the top card of your library. If it's a land card, put it onto the battlefield. Otherwise, put that card into your hand.

Flying Other artifact creatures you control have flying. When this creature enters, until end of turn, each noncreature artifact you control becomes an artifact creature with base power and toughness 4/4.

{T}: Add {C}. {T}: Add one mana of any color. Spend this mana only to cast a legendary spell, and that spell can't be countered.

Whenever one or more other creatures you control leave the battlefield without dying, draw a card. {1}{U}, {T}: Return another target creature you control to its owner's hand.

When this creature enters, return a permanent you control to its owner's hand.

{T}: Add {G}.

When this creature enters, draw a card.

Flying When this creature enters, sacrifice it unless you return another creature you control to its owner's hand.

When Fblthp enters, draw a card. If it entered from your library or was cast from your library, draw two cards instead. When Fblthp becomes the target of a spell, shuffle Fblthp into its owner's library.

When this creature enters, you may destroy target artifact or enchantment. Evoke {1}{G} (You may cast this spell for its evoke cost. If you do, it's sacrificed when it enters.)

{T}: Add {G}.

Flash Flying When this creature enters, draw a card. This creature has deathtouch as long as you control at least three other snow permanents.

Tokens you control have "{T}: Add {G}." Choose a Background (You can have a Background as a second commander.)

Reach {T}, Tap an untapped creature you control: Add one mana of any color.

{T}: Add {G}.

Flash When this creature enters, creatures you control gain shroud until end of turn. (They can't be the targets of spells or abilities.) When this creature enters, sacrifice it unless {G} was spent to cast it.

Flash Flying When this creature enters, target creature you control gains hexproof until end of turn.

When this creature enters, draw a card.

Flash (You may cast this spell any time you could cast an instant.) Flying When this creature enters, sacrifice it unless you return another creature you control to its owner's hand.

Flash Backup 1 (When this creature enters, put a +1/+1 counter on target creature. If that's another creature, it gains the following ability until end of turn.) Hexproof

Whenever an artifact you control enters, look at the top card of your library. If it's a land card, you may reveal it and put it into your hand. If you don't put the card into your hand, you may put it into your graveyard.

Flying As long as you control four or more artifacts, this creature has hexproof. (It can't be the target of spells or abilities your opponents control.) Tap two untapped artifacts you control: Draw a card.

Flying When this creature enters, return a creature you control to its owner's hand.

Reach When this creature enters, return up to one other target permanent you control to its owner's hand.

Ward {2} At the beginning of each combat, other Clues you control become 6/6 Plant creatures in addition to their other types until end of turn. {2}, Sacrifice this creature: Draw a card.

Affinity for artifacts (This spell costs {1} less to cast for each artifact you control.) Flying When this creature enters, draw two cards.

Bargain (You may sacrifice an artifact, enchantment, or token as you cast this spell.) When this creature enters, if it was bargained, exile target artifact or enchantment an opponent controls.

When Uro enters, sacrifice it unless it escaped. Whenever Uro enters or attacks, you gain 3 life and draw a card, then you may put a land card from your hand onto the battlefield. Escape—{G}{G}{U}{U}, Exile five other cards from your graveyard. (You may cast this card from your graveyard for its escape cost.)

When Urza enters, create a 0/0 colorless Construct artifact creature token with "This token gets +1/+1 for each artifact you control." Tap an untapped artifact you control: Add {U}. {5}: Shuffle your library, then exile the top card. Until end of turn, you may play that card without paying its mana cost.

Hideaway 4 (When this creature enters, look at the top four cards of your library, exile one face down, then put the rest on the bottom in a random order.) This creature enters tapped. When this creature leaves the battlefield, put the exiled card into its owner's hand.

When this creature enters, search your library for a Forest card, put that card onto the battlefield, then shuffle.

Any player may cast creature spells with mana value 3 or less without paying their mana costs and as though they had flash.

Return each nonland permanent that's not historic to its owner's hand. (Artifacts, legendaries, and Sagas are historic.)

Return all creatures to their owners' hands.

If you control a commander, you may cast this spell without paying its mana cost. Counter target noncreature spell.

You may sacrifice a nontoken blue creature rather than pay this spell's mana cost. Counter target spell.

You may pay 1 life and exile a blue card from your hand rather than pay this spell's mana cost. Counter target spell.

For each token you control, create a token that's a copy of that permanent.

This land enters tapped unless you control an Island. {T}: Add {U}. {U}, {T}: The next spell you cast this turn has improvise. (Your artifacts can help cast that spell. Each artifact you tap after you're done activating mana abilities pays for {1}.)

This land enters tapped unless you control two or fewer other lands. {T}: Add {G} or {U}.

({T}: Add {G} or {U}.) As this land enters, you may pay 2 life. If you don't, it enters tapped.

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

This land enters tapped unless you control two or more other lands. {T}: Add {G} or {U}.

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

{T}: Add {C}. {3}, {T}, Discard a card: Look at the top X cards of your library, where X is the number of artifacts you control. Put one of those cards into your hand and the rest on the bottom of your library in a random order.

({T}: Add {G}.)

This land enters tapped unless you control a Forest or an Island. {T}: Add {G} or {U}.

({T}: Add {U}.)

This land enters tapped unless you have two or more opponents. {T}: Add {G} or {U}.

{T}: Add {U}.

This land enters tapped. Indestructible {T}: Add {G} or {U}.

{T}: Add {G}.

({T}: Add {G} or {U}.)

As this land enters, you may reveal a Forest or Island card from your hand. If you don't, this land enters tapped. {T}: Add {G} or {U}.

Search your library for a Plains, Island, Swamp, or Mountain card, put it onto the battlefield tapped, then shuffle.

Search your library for a Forest card, put that card onto the battlefield, then shuffle.

Search your library for a basic land card, put that card onto the battlefield tapped, then shuffle.

Search your library for a creature card, reveal it, then shuffle and put that card on top.