Ultimate Masters Booster Pack.
This set contains many great cards such as:
Tarmogoyf
Liliana of the Veil
Karn Liberated
Snapcaster Mage
Engineered Explosives
Karakas
Cavern of Souls
Dark Deapths
Bitterblossom
Emrakul, The Aeons Torn
No card is guaranteed in a booster or box but these are some of the great cards you could get