Players have a hidden “Pack Board” that saves previous packs they pulled to share them with friends and randomized strangers. Some of the most important rules about which pack cannot be in the player’s “board”:
Packs containing a ☆☆ card have some additional restriction(s) on how they’re shared; these details are as of yet not well understood.
Packs containing a ☆☆☆ or a ♕ card won’t be shared.
A “God Pack” can be shared as long as it doesn’t contain any ☆☆☆ or ♕ card.
Information about the content of the Pack Board is currently scarce. Its depth is unknown: we suppose it takes around the last dozen packs opened by the player and its management is unknown. It is uncertain whether every pack a player opens joins the Pack Board or not.
Packs are NOT removed from the Pack Board once shared; the same pack can be sent to multiple friends, and different packs can be shared simultaneously.
Packs shared have no regard for how recently they have been opened; so far, we’ve confirmed 3-day-old packs can still be shared.