Lest you erroneously assume ’Putting this together couldn’t have been that hard’, I urge you: Try to build your own variation. I’m not suggesting this is the only possible iteration, simply that it was astonishingly tougher than I imagined.
•Entire mechanics are rendered unplayable. Flying? Out. Flashback? Gone. Fortify? Nope. Foretell? No way José. Firststrike, Fear, Flash, Fading? No, No, No, No!
•Entire creature types are summarily blackballed. As an example, consider Elves or Dwarves. Current nomenclature tags individual specimens as “Creature—Elf” and “Creature—Dwarf”. How about Merfolk? Nope. Artifact creatures? Negative. There’s always Faeries—oh wait, nevermind. Ah, but what about Shapeshif…you get the picture.
•Perhaps nothing is impacted worse than mana production. is not traditionally reliant on mana dorks, so realistically all our mana was always going to be land-sourced. The problem is that under these strict guidelines most Modern staples are rendered inaccessible.
Shocklands are a complete no-go. They used to be authored in proper English: “As [card name] enters the battlefield”, but that’s since been retconned into the horrendously lazy and linguistically disgusting shorthand “As this land enters”. You might think that solves our issue, but one is still given the choice whether to “pay 2 life.”, then warned “If you don’t, it enters tapped.”
Also, cards like Bloodstained Mire are out—not because they’re colloquially known as ‘Fetchlands’, but because their modus operandi is to ‘, Pay 1 life, Sacrifice Bloodstained Mire: Search your library for a Swamp or Mountain card and put it into play. Then shuffle your library.’
•Support magic is also largely torpedoed. Good luck locating a spell which isn’t merely a temporary boon, increasing our creatures’ attributes only “until end of turn”!