It is a good idea to have a common that you know is legitimate from the same set when doing side by side comparisons
Flickerwisp is one particular card that has a lot of exciting applications
When they enter the battlefield, if you cast it, search your library for up to five Dragon cards not named Tiamat that each have different names, reveal them, put them into your hand, then shuffle. Its nice to draw cards, and drawing five powerful Dragon cards is even nicer
Heliod, Sun-Crowned Even if youre not trying to go infinite with the Walking Ballista combo, if you care about lifegain, you want Heliod, Sun-Crowned in your deck, or in the command zone as one of the best mono-white commanders
Jeskai At the beginning of your upkeep, create a 1/1 red Goblin creature token