Keyword: Haste

Haste
Whenever a creature an opponent controls dies, put a +1/+1 counter on Yahenni, Undying Partisan.
Sacrifice another creature: Yahenni gains indestructible until end of turn.

Double strike, haste
Whenever Lightning Runner attacks, you get (two energy counters), then you may pay . If you pay, untap all creatures you control, and after this phase, there is an additional combat phase.

Improvise (Your artifacts can help cast this spell. Each artifact you tap after you’re done activating mana abilities pays for .)
Trample, haste

Double strike, haste
Whenever Lightning Runner attacks, you get (two energy counters), then you may pay . If you pay, untap all creatures you control, and after this phase, there is an additional combat phase.

Haste
Cascade (When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom of your library in a random order.)

Flying, haste
At the beginning of combat on your turn, choose an opponent at random that Territorial Hellkite didn’t attack during your last combat. Territorial Hellkite attacks that player this combat if able. If you can’t choose an opponent this way, tap Territorial Hellkite.

Eminence — Whenever you cast another Vampire spell, if Edgar Markov is in the command zone or on the battlefield, create a 1/1 black Vampire creature token.
First strike, haste
Whenever Edgar Markov attacks, put a +1/+1 counter on each Vampire you control.

Deathtouch, haste
When Queen Marchesa enters the battlefield, you become the monarch.
At the beginning of your upkeep, if an opponent is the monarch, create a 1/1 black Assassin creature token with deathtouch and haste.

Haste
At the beginning of each player’s end step, if no creatures attacked this turn, put a fury counter on Charging Cinderhorn. Then Charging Cinderhorn deals damage equal to the number of fury counters on it to that player.

Haste
, : Exile target instant or sorcery card from your graveyard.
, , Sacrifice Izzet Chemister: Cast any number of cards exiled with Izzet Chemister without paying their mana costs.

Vigilance, haste
As Saskia the Unyielding enters the battlefield, choose a player.
Whenever a creature you control deals combat damage to a player, it deals that much damage to the chosen player.

Haste
Whenever Ankle Shanker attacks, creatures you control gain first strike and deathtouch until end of turn.

Vigilance, haste
As Saskia the Unyielding enters the battlefield, choose a player.
Whenever a creature you control deals combat damage to a player, it deals that much damage to the chosen player.

Haste
Cascade (When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom of your library in a random order.)

Vigilance, haste
As Saskia the Unyielding enters the battlefield, choose a player.
Whenever a creature you control deals combat damage to a player, it deals that much damage to the chosen player.

Haste
At the beginning of each player’s end step, if no creatures attacked this turn, put a fury counter on Charging Cinderhorn. Then Charging Cinderhorn deals damage equal to the number of fury counters on it to that player.

Flying, haste
: Hellkite Igniter gets +X/+0 until end of turn, where X is the number of artifacts you control.

Haste
Whenever another creature you control dies, it deals damage equal to its power to target player or planeswalker.

Flying, haste
Whenever an opponent casts their second spell each turn, draw a card.
Partner (You can have two commanders if both have partner.)

Trample, haste
Crew 1 (Tap any number of creatures you control with total power 1 or more: This Vehicle becomes an artifact creature until end of turn.)

Trample, haste
When Fleetwheel Cruiser enters the battlefield, it becomes an artifact creature until end of turn.
Crew 2 (Tap any number of creatures you control with total power 2 or more: This Vehicle becomes an artifact creature until end of turn.)

Haste
Whenever Bomat Courier attacks, exile the top card of your library face down. (You can’t look at it.)
, Discard your hand, Sacrifice Bomat Courier: Put all cards exiled with Bomat Courier into their owners’ hands.

Trample, haste
When Fleetwheel Cruiser enters the battlefield, it becomes an artifact creature until end of turn.
Crew 2 (Tap any number of creatures you control with total power 2 or more: This Vehicle becomes an artifact creature until end of turn.)

Flying, haste

Haste
Whenever Speedway Fanatic crews a Vehicle, that Vehicle gains haste until end of turn.