Rivaz of the Claw Although it's technically a lizard commander, Rivaz of the Claw says dragon in the textbox a lot so thats probably a good sign
Blade Beam - - Destroy any number of target tapped creatures with different controllers
#1: Champion of Wits The best Wizard enters-the-battlefield trigger in Standard, by a significant margin, is Champion of Wits, which just happens to be blue, making it an easy inclusion in a deck built around Naban, Dean of Iteration
Powerful Trainers Cards leaving the format While these cards rotating out wont have the same kind of impact as the other cards higher up on this list, they will still remove some interesting strategy options for many players
There are new archetypes, killer boss Monsters, and combos that can go hard if you have the right Monster in hand
Not only that, but challenge runners have found plenty to like about the game as well, attempting to beat the game with various themed decks