Commander creatures you own have "The first Dragon spell you cast each turn costs {2} less to cast."

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.

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

Creatures you control have trample.

Creatures your opponents control lose trample and can't have or gain trample.

Trample

When Avenging Hunter enters the battlefield, you take the initiative.

(Gain the next level as a sorcery to add its ability.)

Legendary creatures you control enter the battlefield with an additional +1/+1 counter on them.

{R}{G}: Level 2

Legendary spells you cast cost {R}{G} less to cast. This effect reduces only the amount of colored mana you pay.

{3}{R}{G}: Level 3

Whenever you cast a legendary spell, exile the top two cards of your library. You may play them this turn.

Scorching Ray -- {8}: Bhaal's Invoker deals 4 damage to each opponent.

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

Sacrifice Commander's Sphere: Draw a card.

Whenever Delina, Wild Mage attacks, choose target creature you control, then roll a d20.

1--14 | Create a tapped and attacking token that's a copy of that creature, except it's not legendary and it has "At end of combat, exile this creature."

15--20 | Create one of those tokens. You may roll again.

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

Defender

When Dragon Egg dies, create a 2/2 red Dragon creature token with flying and "{R}: This creature gets +1/+0 until end of turn."

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.)

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

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Forktail Sweep deals 1 damage to each creature you don't control. (Then exile this card. You may cast the creature later from exile.)

Flying

Whenever Ganax, Astral Hunter or another Dragon enters the battlefield under your control, create a Treasure token. (It's an artifact with "{T}, Sacrifice this artifact: Add one mana of any color.")

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

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

Confounding Clouds -- When Juvenile Mist Dragon enters the battlefield, for each opponent, tap up to one target creature that player controls. Each of those creatures doesn't untap during its controller's next untap step.

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

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

Whenever you cast a noncreature spell, target creature gets +X/+0 until end of turn, where X is that spell's mana value.

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

Flying

Whenever you cast an Adventure or Dragon spell, Lozhan, Dragons' Legacy deals damage equal to that spell's mana value to any target that isn't a commander.

Flying, ward {2}

Whenever another nontoken Dragon enters the battlefield under your control, create a token that's a copy of it, except the token isn't legendary.

{1}{G}, {T}: You may put a creature card from your hand onto the battlefield.

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Mill five cards, then return a creature card milled this way to your hand. (Then exile this card. You may cast the artifact later from exile.)

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.)

Mama's Coming -- Whenever Owlbear Cub attacks a player who controls eight or more lands, look at the top eight cards of your library. You may put a creature card from among them onto the battlefield tapped and attacking that player. Put the rest on the bottom of your library in a random order.

When Patron of the Arts enters the battlefield or dies, create a Treasure token. (It's an artifact with "{T}, Sacrifice this artifact: Add one mana of any color.")

Sacrifice Reckless Barbarian: Add {R}{R}.

Flying

Fire Breath -- When Red Dragon enters the battlefield, it deals 4 damage to each opponent.

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.)

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}: You may put a land card from your hand onto the battlefield.

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

Flying

Whenever Scourge of Valkas or another Dragon enters the battlefield under your control, it deals X damage to any target, where X is the number of Dragons you control.

{R}: Scourge of Valkas gets +1/+0 until end of turn.

Conjure Elemental -- {8}: Untap target land you control. It becomes an 8/8 Elemental creature with trample and haste until end of turn. It's still a land.

Defender

When Stirring Bard enters the battlefield, you take the initiative.

Mantle of Inspiration -- {T}: Target creature gains menace and haste until end of turn.

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.)

Trample

Whenever Thrakkus the Butcher attacks, double the power of each Dragon you control until end of turn.

Haste

Myriad (Whenever this creature attacks, for each opponent other than defending player, you may create a token that's a copy of this creature that's tapped and attacking that player or a planeswalker they control. Exile the tokens at end of combat.)

Flying

Young Red Dragon can't block.

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Create a Treasure token. (Then exile this card. You may cast the creature later from exile.)