Red tends to be associated with Equipment and Vehicles (along with white) or using artifacts as a resource (interacting with things like treasure artifact tokens)
Laelia, the Blade Reforged Laelia, the Blade Reforged draws so many cards, and you can do a neat trick with Laelia's exile payoff and cascade cardsa little rules quirk makes each card you reveal when cascading (or discovering) a unique event, so Laelia gets a counter for each card you go through
When looking at any product, it's important to consider what it could have been, but also judge it based on what it is
I went more in-depth on the card here, if you want a longer analysis
I noticed the broader curve of mana recently while sorting every rare card that I own by price and mana value because I got a new 4 page binder and wanted to separate some of the money cards from the bulk rares
As such, that entire period of the game became known as "Necro Summer," where all Competitive decks were using Necropotence or were specifically designed to counter it