Wicc
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The logic behind the decision was roughly as follows: the differences between the various XL+U templates are much smaller than the differences from the other templates. And it's undesirable to include the entire group due to the imbalance in the template spectrum; it would be necessary to balance it with Sm-s and Panics, which sucks.
Therefore, for the sake of variety, it makes sense to vary the XL+U from tournament to tournament.
For example, in "Wizard OH," Nostalgia was one of the XL+U templates. Why not try 8xm12a here... especially since it's not played often; I haven't seen it at all in HotA.
Replacing 8mm6a with 6lm10a is, in my opinion, quite acceptable, but I thought that many people would be against it. So, it turned out like this.