With how rare Mythics are shouldn't you get way more than 40 gems for duplicates? You would need to get 19 duplicate Mythics to get enough gems for just ONE quick draft. :
Set Boosters | MAGIC: THE GATHERING
CMM Draft Booster Box VS CMM Set Booster Box Math : r/mtgfinance
Mythic Booster [MB-01] - product | DRAGON BALL SUPER CARD GAME
Amazon.com: Magic: The Gathering Core Set 2021 (M21) Draft Booster Box | 36 Booster Packs (540 Cards) | Latest Set : Toys & Games
Dominaria United - Draft Booster Box
Which has more Rares and Mythics? Draft Boosters vs Set Boosters opening - Commander Masters MTG - YouTube
Commander Masters Set Booster Box - Opening and selling all Rares and Mythics - YouTube
No double rares in draft boosters, even if the guaranteed double-sided card is rare. What's next? A foil rare means you don't get a regular rare? >_> : r/magicTCG
What is a Draft Booster in Magic: The Gathering? | TCGplayer Infinite