Sometimes all the factions have the same number of colors (such as the clans on Tarkir), but other times they can be a collection of a different combination of colors (such as the civilizations on Ixalan), usually having every color showing up an equal amount of times, but not always
Check the Wonder Pick tab in the app to see if there are any rare cards available
Why OP-05 changed everything: Introduction of Manga Rare chase cards Shift toward grading, display, and sealed investing Global collector crossover from Pokmon and Yu-Gi-Oh
All-Out Assault Aurelia, the Warleader Aurelia, the Warleader Betor, Kin to All Brightfield Mustang Bumi, Unleashed Dazzling Theater // Prop Room Dazzling Theater // Prop Room Essence of Antiquity Fancy Footwork Full Throttle Great Train Heist Haunted Hellride Molten Note Mutinous Massacre North Pole Patrol Raph & Leo, Sibling Rivals Rustler Rampage Trystan's Command Unswerving Sloth Veteran Beastrider Virtue of Loyalty Watery Grasp Zealous Display
Ashenmoor Liege: devotion lord
It gets big really fast in any format, and biggest in Commander