Your opponents, unless also playing Demon tribal, stand to lose everything
Murders at Karlov Manor is a great example
Summons Rated Mythics Summon: Bahamut: Nine mana is pretty severe, so you need to draft a rampy towns deck around it, but Final Fantasy can support this kind of thing if you work for it
The type of Basic Energy generated by the Energy Zone may be selected during deck customization, with a minimum of 1 Basic Energy type (meaning Colorless Energy can only be generated through other means) and a maximum of 3
They also have the Shift gameplay mechanic that lets you transform an existing character card into the Floodborn version of that character
However, it has one very big downside, which is that it gets discarded at the end of your turn