In the previous Standard format, Mardu Vehicles was one of the premier aggressive strategies. Heart of Kiran backed up by Unlicensed Disintegration was one of the best things that you could be doing. That all started to change with the printing of Fatal Push and rotation of Gideon, Ally of Zendikar, and continued as Ramunap Red proved itself to be the dominant aggressive strategy. That said, with Energy variants dominating the top tables, maybe it's time for Mardu to make a comeback:

Mardu Vehicles - Ixalan Standard | NABENABETK, 5-0 Standard League

• Creatures (21)
• 2 Pia Nalaar
• 3 Hazoret the Fervent
• 4 Bomat Courier
• 4 Scrapheap Scrounger
• 4 Toolcraft Exemplar
• 4 Veteran Motorist

• Instants (7)
• 3 Fatal Push
• 4 Unlicensed Disintegration

• Sorceries (1)
• 1 Cut // Ribbons

• Artifacts (7)
• 1 Skysovereign, Consul Flagship
• 2 Aethersphere Harvester
• 4 Heart of Kiran

• Lands (24)
• 2 Plains
• 3 Mountain
• 2 Aether Hub
• 2 Dragonskull Summit
• 3 Canyon Slough
• 4 Concealed Courtyard
• 4 Inspiring Vantage
• 4 Spire of Industry

• Sideboard (15)
• 2 Abrade
• 2 Authority of the Consuls
• 2 Cast Out
• 2 Chandra, Torch of Defiance
• 2 Chandra's Defeat
• 2 Duress
• 2 Fumigate
• 1 Settle the Wreckage

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The big innovation here is the addition of Hazoret the Fervent. This card is a potent threat on its own, and gives you the ability to grind out damage against control decks outside of combat. Even in situations where you can't get your hand empty, Hazoret is great at crewing vehicles to keep pressure on your opponent.

If you're looking for a deck that walks the line between aggro and midrange, Mardu Vehicles has always been a great option, and the format may be shifting in a direction that favors this combination of potent threats and efficient removal.