You can see an overview here: 90% (4th card), 60% (5th card) 5% (4th card), 20% (5th card) 1.666% (4th card), 6.664% (5th card) 2.572% (4th card), 10.288% (5th card) 0.5% (4th card), 2% (5th card) 0.222% (4th card), 0.888% (5th card) 0.04% (4th card), 0.16% (5th card) So, if you open 1,000 boosters, there should be one to two cards of the crown rarity
Unless evasive threats are suddenly no longer en vogue, I would happily snatch up a pair or more of Djinni Windseers and set up my later turns for success
Note that The Enigma Jewel can tap to help flip itself, but thats still 7 mana, so yikes
This is an android, and iOS native app, it has settings to auto add cards that are scanned, and make sounds, tally costs, etc
This can even allow for an FTK using "Dark Eradicator Warlock" thanks to the "Toon" playstyle's heavy Spell usage
Graduation Thank You Messages for Specific Gifts: Money Gift: Dear [Gift Givers Name], Thank you so much for the generous gift of money for my graduation