Players have an equal chance of opening any one of the 30 cards from a Box Topper booster
One Shiny Vault card replaces the reverse holo (parallel set) if a pack contains a Shiny Vault card, and it seemed to be at a rate of around 1-in-3 to 1-in-4 packs containing a Shiny Vault card
If there isn't, it isn't
#5 Elesh Norn, Grand Cenobite Elesh Norn, Grand Cenobite Secret Lair Drop Series, Mythic As part of the Poker Faces Secret Lair release is Elesh Norn, Grand Cenobite, who is depicted being on Thunder Junction causing mayhem with the locals
While its on the battlefield, players cant cast spells from anywhere except their hands
Goblin Secret Agent This is one of the cards where a mechanic alone could probably make it into normal Magic , but we could never use the secret agent flavor and we thought it was fun enough to pull the card into Unhinged