There are just so many ways to get card advantage with this court that I couldnt leave it off the list, though you could consider nearly all monarch cards forms of card advantage
And then you can also bounce spells and make them recast it for more mana used
Captain Howler, Sea Scourge Fearless Swashbuckler Mendicant Core, Guidelight Mindspring Merfolk Possession Engine Repurposing Bay Riverchurn Monument Sita Varma, Masked Racer Thopter Fabricator Unstoppable Plan Vnwxt, Verbose Host Waxen Shapethief Winter, Cursed Rider
a Wizards of the Coast (December 2, 2025)
This gives it a safety net of being pretty unique should the power level wind up not being quite as high as I expect
Is the fact that the Mountain has primarily green art rather than red a concern or a consideration at all when designing lands like this