It is forbidden to upgrade monsters to levels 1, 6, and 7 in the Conflux Castle.
2.
The same should be done with hero-specialists in magic (it is forbidden to use Solmyr's Chain Lightning without building a 4th-level Guild of Mages).
3.
Perhaps it would be good to explicitly state what happens if the seasonal rules change during the tournament (for example, if some inconsistency in the rules is corrected).
Evgeny, it seems to me that it would be better to sort out these issues before the tournament - otherwise, we'll just be guessing :)