T15 Stones (Temporal Chains & Ignited Ground) & End Game Maps

Devs - Can you please give us some way to reroll our T15s? I don't know if it's just my luck or what but way too many seem to get Temporal Chains and Ignited Ground and they are annoying at best to have to run.

Also, please please please, roll out some of the other maps you've sprinkled in a bit more. Sulphuric Caverns, Augury, Vaal Factory, Seepage are getting quite old.