And needing to pay mana next turn doesnt matter if you can win the turn you cast it, making it an excellent proactive counterspell
The deck would have to run a lot of tokens to make use of Soundwave, Sonic Spys 2nd ability, that lets you cast Instant or Sorceries in the opponents Graveyard for free

Madison Li Dynaheir, Invoker Adept Elsha of the Infinite Elsha, Threefold Master Gandalf of the Secret Fire Gavi, Nest Warden Ghost-Spider Gnostro, Voice of the Crags Hinata, Dawn-Crowned Jodah, Archmage Eternal Kasla, the Broken Halo Kate Stewart Kilo, Apogee Mind Kykar, Wind's Fury Leori, Sparktouched Hunter Liberty Prime, Recharged Narset, Enlightened Exile Narset, Enlightened Master Narset, Jeskai Waymaster Nia, Fabled Skyclimber Numot, the Devastator Optimus Prime, Hero Pramikon, Sky Rampart Ruhan of the Fomori Saint Traft and Rem Karolus Satya, Aetherflux Genius Sevinne, the Chronoclasm Shiko and Narset, Unified Shiko, Paragon of the Way Sokka and Suki Sokka, Tenacious Tactician Tetzin, Gnome Champion The Archimandrite The Face of Boe The Golden-Gear Colossus Vadrok, Apex of Thunder Vadrok, Apex of Thunder Zedruu the Greathearted Zinnia, Valley's Voice Zurgo and Ojutai owyn, Shieldmaiden

For the ones with a nonland on the front, and the land on the back, when you play the card, you will also decide which face you will be playing
With our strategy, we need way more artifact removal than the optimal of an average deck
Instead, it's primarily considered a Limited format intended for MTG drafts - but both the One Ring and the innocuous Orcish Bowmasters made waves in eternal formats, becoming staples