There are so many good raids that were challenging when they came out. Even with Omnibus, they don't feel as challenging or fun. So, here is an idea to make us play them:- 1. Feature an old raid to make the enemies scale to current max CR. It should feel similar in difficulty to the latest episode raid without stat clamping (bring the enemy CRs up?). 2. Give users incentive to play this raid during the feature week by rewarding 5x source marks. 3. The above 5x source marks is loot locked (or just one time) to prevent us from farming it. 4. Space these feature weeks out so they don't conflict with episode, event, survival mode launches.
This already exists, it's an annual event called 'Save the Universe'. It has it's own currency with additional rewards.