If you don't see the email, check other places it might be, like your junk, spam, social, or other folders
Luckily, MTG Arena has a fantastic tutorial that will guide you through everything that you need to know to sling spells in the five colors: White, Blue, Black, Red, and Green
There are usually 5 possible cards you can get in a promo pack, so keep doing the battle challenges until you unlock them all
Whats more is that Kit Cloudkicker, Navigator has the Ward keyword too, meaning that it cannot be targeted by opponents unless through a challenge: thereby giving it even more longevity and thus even more opportunities to quest for three lore a turn
Of course it was outclassed pretty quickly in that role, and it was never that good anyhow
These collectible cards have a different card back and are therefore not legal in any sanctioned Magic event