Once you’ve unlocked Puzzle 9, you’ll have access to Magical Creatures. These creatures provide bonus Power-Ups in Puzzles.
To view your Albums, tap the Hagrid’s Hut icon on the top left side of the Play Panel home screen.
To unlock a Creature, complete Puzzles to earn Stars and fill the Star Pack Meter.
Each Star Pack grants 3 random Cards: Common, Rare and Legendary.
There will be times that you will get Duplicate Cards. No worries! You will receive a unique NEW card once your Duplicate Meter has been filled. 
To view the Creatures that you have earned, tap the Profile button.
Then tap the Select button.
Tap on the Arrow button to view the available Magical Creatures and the Win Streak Bonuses that each of these Creatures can provide.
When you have completed an Album, you earn a Limited Edition Creature.
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Harry Potter: Puzzles & Spells Game GUIDE