They're great for long-time Magic fans and first-time players
For an item to become truly valuable over time, it usually needs to become genuinely scarce
Four-Color Omnath For simplicity Ill call this deck Four-Color Omnath instead of control, midrange, or elementals
How does this affect me, the player
The problem with Battle of Wits is that when you consider you will need 200 cards in your deck once it hits the battlefield and that it might take several (or many) turns to get Battle of Wits on the battlefield, you will need to play somewhere around 240 cards to make Battle of Wits work, which means you're increasing your deck size by 300%, which in turn leads to a massive drop in consistency, to the point where Battle of Wits simply isn't worth the cost in competitive decks
while the card had seen appreciation in value, I think it was a clear case of a small subset of buyers creating irrational marketplace conditions that led to some serious FOMO on collectors who were sitting on a bit of a lull in terms of what was happening in the marketplace at the turn of the year