The goal is to fill your deck entirely with cards that cost two or less mana so that no matter what card you reveal, you can cast it
A standard red trumpet-style buff
Dauthi Voidwalker Modern Horizons 2 introduced tons of busted cards to Magic, including powerhouse Dauthi Voidwalker
Other cards have done poorly, even when protected by the Reserved list, loosing value over the years
I found this out when I wrote an article talking about the design for Bestial Menace, which I assumed had followed a similar path to Moose and Squirrel, only to learn from Kelly that he had designed the card
The rampier you are, the more mana you can make each turn and this will let you do something each turn with that Cabal Coffers or Nykthos to save it for a later X spell