Rivals of Ixalan

When Champion of Dusk enters the battlefield, you draw X cards and you lose X life, where X is the number of Vampires you control.

Other Vampires you control get +1/+1.

When Dusk Legion Zealot enters the battlefield, you draw a card and you lose 1 life.

When Martyr of Dusk dies, create a 1/1 white Vampire creature token with lifelink.

Flying

Defender When Gleaming Barrier dies, create a Treasure token. (It's an artifact with "{T}, Sacrifice this artifact: Add one mana of any color.")

Ascend (If you control ten or more permanents, you get the city's blessing for the rest of the game.) As long as you have the city's blessing, Slip...

Mist-Cloaked Herald can't be blocked.

As an additional cost to cast this spell, reveal a Merfolk card from your hand or pay {3}. When Silvergill Adept enters the battlefield, draw a card.

When Forerunner of the Legion enters the battlefield, you may search your library for a Vampire card, reveal it, then shuffle your library and put ...

When Forerunner of the Heralds enters the battlefield, you may search your library for a Merfolk card, reveal it, then shuffle your library and put...

When Ravenous Chupacabra enters the battlefield, destroy target creature an opponent controls.

As an additional cost to cast this spell, reveal a Pirate card from your hand or pay {2}.

When Forerunner of the Empire enters the battlefield, you may search your library for a Dinosaur card, reveal it, then shuffle your library and put...

Flying Whenever Majestic Heliopterus attacks, another target Dinosaur you control gains flying until end of turn.

Famished Paladin doesn't untap during your untap step. Whenever you gain life, untap Famished Paladin.

Whenever a Merfolk you control deals combat damage to a player, draw a card.

Flying Ascend (If you control ten or more permanents, you get the city's blessing for the rest of the game.) Whenever another creature you control ...

Defender {2}: Golden Guardian fights another target creature you control. When Golden Guardian dies this turn, return it to the battlefield transfo...

Attacking Pirates you control get +2/+0.

Enrage — Whenever Siegehorn Ceratops is dealt damage, put two +1/+1 counters on it. (It must survive the damage to get the counters.)

Ascend (If you control ten or more permanents, you get the city's blessing for the rest of the game.) Storm Fleet Swashbuckler has double strike as...

Other Merfolk you control get +1/+1.