Turning all your artifacts into Mox Sapphire and coming into play with a massive artifact creature is great, but its activated ability gives you an outlet for all that surplus mana
The +10/+0 and vigilance is going to make whatever legendary creature wielding it hit like a truck too
Cards like Narset of the Ancient Way and Sorin, Grim Nemesis benefit from discarding a split card since it deals damage equal to the mana cost
Unless youve got ways to place +1/+1 counters on Creatures, youre enticed to cast the Vehicle side Jetfire, Air Guardian first, as a 3/4 flyer that can Adapt 3 to become a 6/7 Flying Creature Youre effectively paying 7 Mana to get that 6/7 Flying robot, but you do have the option of removing those +1/+1 counters for colourless Mana
Furthermore it fills up your graveyard which makes splits with flashback cards involved extra hard and can be generally useful for many things from Snapcaster Mage to Psychatog
When you directly target another creature, your acerbic wit is so potent you can't help but gain a boon from it