Elesh Norn, Mother of Machines is a five-mana White 4/7 with vigilance, because youve gotta have vigilance to be a White legendary creature now
For example, we decided that the set wouldn't have talking animals
Ragemonger is more effective the more multicolored minotaurs you play, so load up on horns
Pitiless Carnage Marcy: Some form of Aristocrats is going to make very good use of this card, and the Plot cost will allow you to set it up so that while people see it coming, it also means you've got time to get your combo exactly the way you want it, and to just go for the throat from there
Either way, if your meta is creature-heavy, Balefire is the kind of card that ends arguments fast
For cube however playability is such a massive consideration for potential additions that it is my go to attribute for rating cards