I never thought about the DICE summoners being free. That would be a huge change to the game. At this time thorns are so incredibly overpowered at low levels. It can be beaten but you can easily win 90% of matches without even thinking of your team.
I won the new dragon epic Djinn Chwala and it is insanely powered as well just cause of thorns. I am getting amazing win rates using him and the basic dragon summoner.
While I'm not into nerfs for anything, something needs to be done to make some of the other beginner summoners viable.
I think I heard/read it somewhere, but of course that doesn't mean it will happen. But I don't see any other possibility to provide 2 summoner for all players in wild mode, if the Dice summoner wouldn't be used for that.
I think that players from 1000 rating are already much better prepared for Mylor, but up to 1300 rating you achieve even there at least a 50% win rate.
If Mylor was actually added to the Spellbook as a free Summoner, I can see absolutely every beginner playing only Mylor. This would of course lower the quality of play, put a lot of monsters at a disadvantage, and lower the investment value of Mylor for quite some time.