It represents the very foundation of Magic: The Gathering history, a perfect combination of power, rarity, and nostalgia
Two Most Popular Treasure Commanders According to EDHREC, Prosper, Tome-Bound is the most popular Commander utilizing the Treasure archetype
Temur Rhinos is the only deck playing Crashing Footfalls in the format, but it has been performing quite well in the recent past which is why the card made this top 5
Stet, Draconic Proofreaders white ability helps to make sure that the damage will resolve
As noted earlier, the cards weren't initially perceived as collectibles
I think from a pure perspective of power balancing and card quality, no card should have this power for just a single mana in Modern