For now, though, it's totally legal and very, very scary
It is a real bugger having to wait till seven mana to kill a Goblin Welder with a Dragonlord Atarka
[C][C][C] Crystal Blast: 60+ damage
The decks themselves come with a little bit of lore to get you in the mood as well as some tips for playing them appropriately
Agatha's Champion's fight effect is ideal to either destroy a would-be blocker or take out a small creature with relevant abilities, or dispatch a flier that the green deck can't easily block
10 Werebear Werebear isn't the most impressive mana dork in Commander, nor is the threshold power bump that important in the format, but when your commander wants you to commit to a typal theme, it's best to play as many on-theme creatures of that type as you can