Ambitious Dragonborn enters the battlefield with X +1/+1 counters on it, where X is the greatest power among creatures you control and creature cards in your graveyard.

Flying

Whenever Ancient Bronze Dragon deals combat damage to a player, roll a d20. When you do, put X +1/+1 counters on each of up to two target creatures, where X is the result.

Flying

Whenever Ancient Silver Dragon deals combat damage to a player, roll a d20. Draw cards equal to the result. You have no maximum hand size for the rest of the game.

Flying

Project Image -- When Astral Dragon enters the battlefield, create two tokens that are copies of target noncreature permanent, except they're 3/3 Dragon creatures in addition to their other types, and they have flying.

Flying

When Destructor Dragon dies, destroy target noncreature permanent.

When Draconic Muralists dies, you may search your library for a Dragon card, reveal it, put it into your hand, then shuffle.

Flash

Drag Below -- When Dragon Turtle enters the battlefield, tap it and up to one target creature an opponent controls. They don't untap during their controllers' next untap steps.

{1}, {T}: Draw a card, then discard a card.

Dread Linnorm can't be blocked by creatures with power 3 or less.

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Put two +1/+1 counters on target creature and untap it. It gains hexproof until end of turn. (Then exile this card. You may cast the creature later from exile.)

This spell costs {X} less to cast, where X is the total mana value of Dragons you control.

Flying, trample

{2}{G}, Sacrifice a land: Return Earthquake Dragon from your graveyard to your hand.

Flying, trample

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Counter target activated or triggered ability from a noncreature source. (Then exile this card. You may cast the creature later from exile.)

Flying

When Foe-Razer Regent enters the battlefield, you may have it fight target creature you don't control.

Whenever a creature you control fights, put two +1/+1 counters on it at the beginning of the next end step.

Flying

Poison Breath -- When Green Dragon enters the battlefield, until end of turn, whenever a creature an opponent controls is dealt damage, destroy it.

Flying

When Jugan, the Rising Star dies, you may distribute five +1/+1 counters among any number of target creatures.

Flying, ward {3}

When Kairi, the Swirling Sky dies, choose one --

• Return any number of target nonland permanents with total mana value 6 or less to their owners' hands.

• Mill six cards, then return up to two instant and/or sorcery cards from your graveyard to your hand.

Flying

When Keiga, the Tide Star dies, gain control of target creature.

You may look at the top card of your library any time.

You may cast Dragon spells from the top of your library.

Flying, deathtouch

When Kura, the Boundless Sky dies, choose one --

• Search your library for up to three land cards, reveal them, put them into your hand, then shuffle.

• Create an X/X green Spirit creature token, where X is the number of lands you control.

Delve (Each card you exile from your graveyard while casting this spell pays for {1}.)

Flying

Murktide Regent enters the battlefield with a +1/+1 counter on it for each instant and sorcery card exiled with it.

Whenever an instant or sorcery card leaves your graveyard, put a +1/+1 counter on Murktide Regent.

Bigby's Hand -- {T}: Untap two other target permanents. Activate only as a sorcery and only once each turn.

Flying

When Oceanus Dragon enters the battlefield, tap target creature an opponent controls. Goad it. (Until your next turn, that creature attacks each combat if able and attacks a player other than you if able.)

Flying

Whenever a creature you control deals combat damage to a player, create that many Treasure tokens.

When you cast this spell, create a token that's a copy of it, except it isn't legendary.

{T}: Add {C}. Spend this mana only to cast an artifact spell or activate an ability of an artifact.

Paradox -- Whenever you cast a spell from anywhere other than your hand, investigate. (Create a Clue token. It's an artifact with "{2}, Sacrifice this artifact: Draw a card.")

Flying

When Phantasmal Dragon becomes the target of a spell or ability, sacrifice it.

You may cast Dragon spells and artifact spells as though they had flash.

Choose a Background (You can have a Background as a second commander.)

Flying

Spells you cast from anywhere other than your hand cost {2} less to cast.

Foretell {4}{U} (During your turn, you may pay {2} and exile this card from your hand face down. Cast it on a later turn for its foretell cost.)

This spell costs {1} less to cast for each card you own in exile and in your graveyard that's an instant card, a sorcery card, or a card that has an Adventure.

Ward {4} (Whenever this creature becomes the target of a spell or ability an opponent controls, counter it unless that player pays {4}.)

Flying

Whenever Sapphire Dragon attacks or blocks, scry 2.

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Counter target noncreature spell. (Then exile this card. You may cast the creature later from exile.)

{T}: Add {G}. When you spend this mana to cast a Dragon creature spell, you gain 2 life.

Flying

As long as you control four or more artifacts, Shimmer Dragon has hexproof.

Tap two untapped artifacts you control: Draw a card.

Sisterhood of Karn enters the battlefield with a +1/+1 counter on it.

Paradox -- Whenever you cast a spell from anywhere other than your hand, double the number of +1/+1 counters on Sisterhood of Karn.

Whenever Skanos Dragonheart attacks, it gets +X/+X until end of turn, where X is the greatest power among other Dragons you control and Dragon cards in your graveyard.

Choose a Background (You can have a Background as a second commander.)

Flying

{2}: Steel Hellkite gets +1/+0 until end of turn.

{X}: Destroy each nonland permanent with mana value X whose controller was dealt combat damage by Steel Hellkite this turn. Activate only once each turn.

Paradox -- Draw a card for each spell you've cast this turn from anywhere other than your hand.

Foretell {1}{U} (During your turn, you may pay {2} and exile this card from your hand face down. Cast it on a later turn for its foretell cost.)

Sword Coast Serpent can't be blocked as long as you've cast a noncreature spell this turn.

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Return target creature to its owner's hand. (Then exile this card. You may cast the creature later from exile.)

Paradox -- Whenever you cast a spell from anywhere other than your hand, put a +1/+1 counter on target creature.

Team TARDIS -- At the beginning of your end step, untap each creature you control with a counter on it.

At the beginning of your end step, if you had a land enter the battlefield under your control this turn, venture into the dungeon. (Enter the first room or advance to the next room.)

Flying

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Scry 1, then draw a card. (Then exile this card. You may cast the creature later from exile.)