HALL OF HEROES
Runs Sunday to Tuesday this week. This is where you buy PAST generation Mythic heroes (shards + Widget) with Mark of Valors — not your current generation's heroes, that's still Hero Roulette.
You get 1 free Mark and 300 free gems spread across the 3 days automatically.
If you're missing an older-gen Mythic hero or its Widget, this is your best shot at it. Otherwise, save your gems for Hero Roulette or other priorities instead of forcing a buy here.
Marks never expire but are locked to the generation they're from, so no rush if you're not targeting anything specific this week.