Peppy Gals or Universe Survival Saga cards increase the chance of drops. The following characters have both of those categories and double the drop chance.
AGL UR Characters
Ferocious Counterattack Android 18
Dokkan Battle Reroll Tier List
Ultimate Awakened Power
Passion Beyond Pride Super Saiyan 2 Vegeta
Crimson Flare Super Saiyan 4 Vegeta
Eternal Horror Legendary Super Saiyan Broly