The pack will always give you cards you dont already have four of, or, if youve collected four of every rare and mythic rare in Standard , you will be credited with gems instead
No, you can't just flip cards in Magic
Also, being a Level 8 monster, it can be used with "Archfiend Empress" and "Archfiend Emperor" to Xyz Summon Rank 8 Xyz Monsters, or just attack en mass to win the game
Jinnie Fay, Jetmirs Second Jinnie Fay, Jetmir's Second allows you to turn any token you create into 2/2 cats or 3/1 dogs, so you dont even need to buff them to be better than 1/1 creatures
Jumbo: 6 packs per box / 20 Cards per pack (Slightly higher hit rate)
The booster box format contains multiple sealed booster packs from the OP-10 set