Strengths Card draw/selection: Dimir is easily one of the best color pairs for drawing cards
With the combos, the synergies, the tutors, the protection, and more, it can be a bit antagonistic
Jumpstart takes the best parts of Limited and Constructed Magic and fuses them into a dynamic, innovative play experience
This elemental commanders lifegain can build you a cushion and give you some extra time, the extra mana can make it a lot easier to cast more spells each turn, and dealing damage can be really helpful for removing planeswalkers or at least fending off their ultimate abilities
The fact that it's an artifact is great too, since even though Affinity lists might not want this, it has some great synergy with Deadly Dispute-style cards in general
Sagas normally get a lore counter when they enter the battlefield, and then another lore counter at the beginning of your precombat main phase, triggering the appropriate chapter each time