The deck is a bunch of sacrifice outlets, cards that make tokens/disposable creatures, and cards that care about other creatures dying
Curiously, From The Vault foil cards are also heavier than a normal MTG card, however, these cards are still legal in all formats
Mental Misstep is better in legacy and the like but in cube there isn't enough
Sure, it costs the same amount as Jace, the Mind Sculptor and it isnt nearly as powerful, but theres a lot of room for a card to be worse than a card thats banned in Modern and still be good
Counter strategies like this are primed for doublers, and big tramplers like Loyal Guardian are always welcome in aggressive decks
Hangarback Walker is high on my list of cards to support sacrifice decks and delirium, and while it has the potential to be significantly more powerful than Solemn Simulacrum I believe it firmly lands in the category of colorless cards that feel like youre paying for what you get