The offer of the week is a gold framed Release of Energy for only 15 credits.
Limited 1 purchase per person.
The offer is automatically generated each week with a random Gold card and a random cost between 15-40 credits. Check back regularly.
Silver, Gold and Diamond cards works the same as Normal cards when playing (this is not a pay-to-win game) but if you win with a deck composed of framed cards you earn additional credits. A gold card can be converted to any other silver card and three copies of the same gold card can either be converted to a Diamond version of the same card (which you will be able to sell for real money) or any other gold card.
For more information see the page Your Online Cards.
Print of https://thespacewar.com/weekly-offer