Personally I’m not a fan of the “pattern” or “set rotation” in the game…
It’s not found anywhere in the game outside of scheduling & the rare stuff (rare titans follow a colour cycle, rare quests follow a cycle, monthly quest follows a cycle)
I personally would prefer that the rule, star rating and elemental restrictions be governed by RNG (as is the case with war rules, token drops, other quest appearances etc…)
My RNG solution:
My suggestion would be
Hero Resrriction*
40% chance for 5*
35% chance for 4*
25% chance for 3*
Rule
Even split across all rules (current and future)
Thus 33.33% chance for each rule
(Buff booster, rush attack, bloody battle)
Elemental restrictions
Even chance for all restrictions, including no restriction.
Thus 16.667% chance for each colour restriction (no red, blue, green, purple, yellow, none)
Additional proposal - class restrictions
I’d also like to add in a proposal for class restrictions.
No class restrictions = 30%
7% chance for restriction on any of the 10 classes