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
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
You don't choose targets for Miasma Demon's last ability at the time it triggers
5 cards of rarity Rare or higher in every pack
I feel like Isshin, Two Heavens as One might be the better attack + slug/drain/burn Commander, and I think for the hoops to jump through and suboptimal cards it requires, Far Fortune is more of a flavor pick than a power pick
Two Most Popular Treasure Commanders According to EDHREC, Prosper, Tome-Bound is the most popular Commander utilizing the Treasure archetype