Here are the 6 fathomless descent cards: Chupacabra Echo Matzalantli, the Great Door / The Core Song of Stupefaction Souls of the Lost Squirming Emergence Terror Tide Here are the 18 descend X cards: Akawalli, the Seething Tower Basking Capybara Bygone Marvels Chitinous Crawler Coati Scavenger Council of Echoes Didact Echo Echo of Dusk Frilled Cave-Wurm Join the Dead Malamet Veteran Starving Revenant Stinging Cave Crawler The Ancient One The Everflowing Well / The Myriad Pools Uchbenbak, the Great Mistake Wail of the Forgotten Waterlogged Hulk / Watertight Gondola Here are the 12 cards that check if you've descended this turn: Brass's Tunnel-Grinder / Tecutlan, the Searing Rift Broodrage Mycoid Canonized in Blood Child of the Volcano Corpses of the Lost Deep Goblin Skulltaker Enterprising Scallywag Molten Collapse Ruin-Lurker Bat Stalactite Stalker The Mycotyrant Zoyowa Lava-Tongue Best Descend Cards #7

I didn't expect to add some self-indulgent reminiscing into my Commander review so sorry for the ramble, but yeah, I really like this card
Deification feels like an Oathbreaker card, honestly
These SLs include several cards from the Adventures in the Forgotten Realms and Battle for Baldur's Gate sets, including some that were exclusive to the precon decks and have never been printed in foil
The Final Fantasy x Magic: The Gathering crossover panel at PAX East revealed some of the mechanics from the video game that are being adapted into the tabletop card game, including some surprising ones