This is usually because it lacks the black core layer
Every card in the game needs CP of its own rarity to craft: normal needs CP N, rare needs CP R, super rare needs CP SR, and ultra rare needs CP UR
I was just blessed with people and information, and I kept taking action
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
In addition to tournaments, they regularly host art events where you can interact with MTG artists