They mix well with Adventure or Therion, not to mention a handful of other archetypes, so people can experiment and use their creativity more than with some other archetypes
We'll examine some corner cases in a bit, but the rules of thumb to keep in mind are: First and foremost, the replacement effect has to be in play before the event it replaces
And, because it was extremely generic, it made Yu-Gi-Oh
Crabominable ex is classified as a 4-Diamonds card in the Celestial Guardians set
The second season however shifts focus to a futuristic threat that isn't as intrinsically tied to these cards, allowing another group of characters with powerful ancient cards to try and take on this evil as well
Yanmega ex takes 20 additional damage from Lightning-type attacks