You may spend the two mana added by the last ability on the same Mount or Vehicle spell or on two different Mount or Vehicle spells
With this, you can tap down a blocker and ensure your creatures connect, and in exchange, everyone will get the chance to draw cards and make for a much more impactful and fun game
It's mostly used in the same way that people use Burning Wish and Cunning Wish in Legacy: it can find a potentially game-winning combo piece but also a ton of unique answers like Fracturing Gust, Firespout, Slaughter Games, Flesh / Blood and Wear / Tear
Additionally, I as a Pokemon newbie am able to grab a starter deck, soup it up a little, and still compete on online play
Its most comparable to Soul of the Harvest, but at one less mana and with flying instead of trample
The goal is to build out a battlefield with lots of power and toughness