Treasure

A lot of people get upset when their treasure is stolen early game. It's important to realize that the items you get from treasure aren't really valuable. There are a few important facts to note about treasure and the purpose it servers.

Treasure is used for three things, to create a card, to donate to your order, and to encourage people to attack you.

To create the card you need one of each of the colors. Each race has the ability to get certain colors. Rage of Bahamut does this to encourage people to battle. Besides battling opponents with the treasure you want, you can also ask people in your order to gift it to you. I find the latter way to be faster. Once you gather your treasure, you create a card. This card cannot be evolved and is generally very weak. Most often you will see people trying to trade "treasure cards" to new players. Because these cards aren't valuable they don't really warrant pushing to completion.

Sometimes events require you to gather treasure. Event treasure cannot be gifted and it is necessary you fight for it. Cards from even treasure are generally better than cards from normal treasure and at least for the Easter event, could be evolved.

You can also donate your excess treasure to your order. This treasure counts as rupies donated to your order. This is a very common use for treasure.

Finally, stockpiling treasure acts as a nice carrot to get people to attack you. I get people attacking me several times a day for treasure because I use a weak face card on my deck for my level, maintain heavy treasure, and don't have a huge amount of defense points. About one in eight attacks beat my defense. Because of this each time an opponent loses I gain 2-10k rupies.

What I want you to pull away from this:
Treasure isn't valuable. Don't let people trick you into trading for treasure cards. Treasures primary purpose once you get the card is to donate to the order. Stockpiling treasure is a good way to get people to attack you.