Marginally Optimized AFK Sporyl

20 permanent Morale with passive Vulnerable application from Magna counters once your hand is 10 Spores, to give Sporyl's damage ceiling that little bit of extra reach. Magna can additionally add more Extra Attack damage through the Starlight and Dreams set while Rei covers the usual Glory's Reign.

The only Tower fights that needed resets for me were once against 135 Elemental Spirit due to losing too much HP early on to facetank even a single round from him, and twice against 141 Vulkano due to needing to crack an egg to prompt a resummon in order to get an extra turn to safely continue setup. All other fights were beaten without issue.

As this team requires multiple turns of setup before you can go AFK, I do not recommend using this outside of Tower or any Great Rift/FSO that lets you get away with it (unlikely, and probably wouldn't net you good scores either).

Memory Frags/Additional Notes

ベリル

Beryl can use Opening Found (or E6 Condense shots) plus Quick Shelling to activate 2 of the 3 conditions for the Battlefield Evolution memory frag set for a nice +20% crit damage on top of the standard Executioner set. Glory's Reign is not recommended here, as Rei can activate it herself and the set does not stack. If a 2/2/2 set is preferred, then the following changes should be applied to the decks: replace Quick Shelling with another Negotiate, change one of Magna's +1 Morale/Resolve Divines into an additional -1 Cost on a Frost Charge, and replace one of Rei's Crimson Lumens with another Gear Bag. This will maintain the capped 20 Morale while also reducing the AP requirements on Magna and providing extra draw (which honestly is likely preferable, but shiny new frag set is shiny and new).

マグナ

Magna uses the Starlight and Dreams set to provide bonus damage to Beryl's Extra Attacks. As this requires obtaining Shields five separate times by abilities (no, Crystallization does not count), two copies of Residual Herb are used to fully stack it very quickly and for no AP cost. Frost Shields are kept in the deck to make the memory room for the Herbs, and are the best targets for Rei's Snack Times.

レイ

Rei uses the usual Glory's Reign set, easily achieved through Snack Times and Gear Bags. Crimson Lumens can be substituted with First Aid Kits, but these are more difficult to use due to very few ways to activate them via Celestial.