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
While the first ability grants you more counters, the second and third abilities take away counters (but are more powerful effects)
With the combos, the synergies, the tutors, the protection, and more, it can be a bit antagonistic
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
Strengths Card draw/selection: Dimir is easily one of the best color pairs for drawing cards