Spells that when they Resolve Sac a Land for Any Lands There are four of these, one four-cost sorcery that broke Standard with Valakut, and then sacs any number for any lands out tapped
Wilderness Reclamation Banned in various 60-cards formats because doubling your mana is cracked, Wilderness Reclamation is likely underused in Commander because its been pretty expensive for an uncommon up until now
One might even venture (Im thinking about it), that for early Magic, world-building was primarily about providing a usable and attractive user-interface for a rules system
Between the huge influx of playables (and bannables!) from Modern Horizons , as well as a bevy of design mistakes like Once Upon a Time, Oko, Thief of Crowns, and Uro, Titan of Nature's Wrath, Modern has actually been a format in perpetual chaos and upheaval over the last few years