By farming all available missions, you should be able to accumulate a solid amount of Pack Hourglasses to open an extra 1-3 Booster Packs per day at minimum, or even up to 10+ booster packs, depending on how many missions you still have available at the time
For example, Paladin of Predations Toxic 6 deliver six poison counters to any player they manage to would
The Loyal Three and Pecharunt have all had their personalities portrayed perfectly in Night Wanderer, making for some truly unique cards
The event varies by League, but can include tournaments, friendly battles, and how-to-play sessions
Friends on the Other Side, Let The Storm Rage On, and Strength of a Raging Fire all fit great and can be used in lots of other decks