Modern Horizons 3 contains the 5 basic lands (Plains, Island, Swamp, Mountain, and Forest) with variant treatments, plus an uncommon Snow-Covered Wastes (included as one of the 101 uncommons) with its variant treatments
As expected, the potential of this build is also limited, given its early access design and complete lack of cards outside March of the Machine
They may occasionally pop up in competitive EDH decks, the most notable being whenever Rick, Steadfast Leader shows up once in a blue moon in a Legacy Humans decklist
Karazikar triggers when you attack, which means it doesn't actually have to be the creature attacking
And this is one of the nicer interactions I could think of choices between Tooth and Nail, Kiki-Jiki, Mirror Breaker, and Pestermite exist on the meaner end of the spectrum, and they will just end the game outright