When a TCG runs for long enough, even cards that were balanced upon release might become broken thanks to how newer cards interact with them, ultimately leading to the original versions being removed from allowed tournament play
Ogdoadic monsters do not have much benefit from being banished, so I avoid doing so unless absolutely necessary
You may include cards that have rules text that overrides this restriction or state that you may (or must) play multiple copies at the same time up to the number of cards indicated in the cards rules text
Ps, I'll add you guys in too, send me a comment telling me what type of deck you use/a list of cards in your deck and I'll decide on the best and put it to a vote
The 2013 Worlds format was initially dominated by Team Plasma decks, a Big Basic archetype that succeeded, in part, due to being able to take Knock Outs on the first turn of the game
Then you look at its MTG creature type and realize it's just a freaky human wearing a cow's head