Summons, while present in most FINAL FANTASY games, get a lot more attention in the story of FINAL FANTASY X as you follow Yuna's path as a summoner
Other common plot and setting themes include the Gaia hypothesis, an apocalypse, the heroes' defiance against fate and the gods, and conflicts between advanced technology and nature
What were interested in, though, is this vehicles card draw ability
Its also nice to get a chance at spotting a counterspell in your opponent's hand so that you can play around it the best you can if they're running blue
And most of all, it's cheap
But you can slot in a Hired Claw or whatever and have most of your Red Deck intact