Flying

Domain — Aven Trailblazer's toughness is equal to the number of basic land types among lands you control.

Whenever an instant or sorcery spell you control deals damage, create two 1/1 red and white Soldier creature tokens with haste.

: Add .

: Add . Activate only if you control a Swamp or a Mountain.

+1: Discard a card. If a red card is discarded this way, Chandra Ablaze deals 4 damage to any target.

−2: Each player discards their hand, then draws three cards.

−7: Cast any number of red instant and/or sorcery cards from your graveyard without paying their mana costs.

Other Elementals you control get +1/+0.

: Creeping Trailblazer gets +1/+1 until end of turn for each Elemental you control.

During your turn, Embereth Skyblazer has flying.

Whenever Embereth Skyblazer attacks, you may pay . If you do, creatures you control get +X/+0 until end of turn, where X is the number of opponents you have.

Menace (This creature can't be blocked except by two or more creatures.)

: If Kellan is a Scout, it becomes a Human Faerie Detective and gains "Whenever Kellan deals combat damage to a player, exile the top card of your library. You may play that card this turn."

: If Kellan is a Detective, it becomes a 3/2 Human Faerie Rogue and gains double strike.

When Mardu Blazebringer attacks or blocks, sacrifice it at end of combat.

, Discard a card: Draw a card.

Each time target permanent would deal damage to a permanent or player this turn, it deals double that damage to that permanent or player instead.

Splice onto Arcane (As you cast an Arcane spell, you may reveal this card from your hand and pay its splice cost. If you do, add this card's effects to that spell.)

Rattleblaze Scarecrow has persist as long as you control a black creature. (When this creature dies, if it had no -1/-1 counters on it, return it to the battlefield under its owner's control with a -1/-1 counter on it.)

Rattleblaze Scarecrow has haste as long as you control a red creature.

Searing Blaze deals 1 damage to target player or planeswalker and 1 damage to target creature that player or that planeswalker's controller controls.

Landfall — If you had a land enter the battlefield under your control this turn, Searing Blaze deals 3 damage to that player or planeswalker and 3 damage to that creature instead.

Vigilance

Whenever you cast a creature spell, create a 1/1 red Mercenary creature token with ": Target creature you control gets +1/+0 until end of turn. Activate only as a sorcery."

: Choose a color. Add one mana of that color for each different power among creatures you control.

Target creature can't be blocked this turn.

When Trailblazer's Torch enters, you take the initiative.

Whenever equipped creature becomes blocked, it deals 2 damage to each creature blocking it.

Equip (: Attach to target creature you control. Equip only as a sorcery.)

Tap an untapped Zombie you control: Target land becomes a Swamp until end of turn.

Tap an untapped Zombie you control: Target creature gains swampwalk until end of turn. (It can't be blocked as long as defending player controls a Swamp.)