All around, Ariel is a fantastic payoff for item decks
With loads of enchantment creatures about thanks to Final Fantasy and Duskmourn, it will be particularly helpful to have a one mana counterspell that can deal with them - or with Izzet Cauldron's cauldrons
Hail, Caesar is the Fallout Commander deck with all the twisted realities of human civilization following the nuclear apocalypse
Hydroid Krasis also has the fun creature type Jellyfish Hydra Beast: I just looked up the Jellyfish tribe while typing this and can confirm there are now 9 Jellyfish that are Commander-legal, so expect Richard to win with the tribe in a future Commander Clash
What custom Magic cards usually means (so you dont overcomplicate it) Most people making custom Magic: The Gathering cards fall into one of these buckets: Alt-art re-skins: Same card text, different art and vibe (your Sol Ring is now a cursed waffle iron, as it should be)
You can sacrifice Ranger-Captain to stop opponents from casting noncreature spells for the rest of the turn