When you click on the Airship Dock, then on Merchant Airship, you will have 6 possible trades to make: 4 resources trades and 2 products trades. After you click exchange and complete the trade, a $ 0.99 package might become available. This usually happens once a day if you make most of the exchanges available during the day. If you buy the pack, you have a chance of winning the Grand Clan Reward.

Merchant airship 2
The $.99 pack contains
Random Gem x1

Crystal Bag 1-3x

Random Shard x30

Random Building Item x30

Speed Up 1m x60

100 VIP Points x2

Random resource production boost x1

Fast Travel I x1

Common Rune Picker x5

Random Commerce Item x100

Community content is available under CC-BY-SA unless otherwise noted.