Black and Red Both black and red are top tier, with black being the best color in the format
K (Radiant): Special holographic finish
Note that this designation can qualify for encapsulation as "Authentic Altered" at the grader's discretion and if "AA" is listed on the submission form as the desired minimum grade
If we assume that the average two-color, 40-card draft deck will want 5-8 fixing lands, we can extrapolate to find the cube totals: This, like our example Pauper and Standard decklists, suggests that between 60-100 fixing lands would be a good minimum at 360 to ensure that two-color decks are able to reliably cast their spells (according to Frank Karstens definition of reliably)
Your future self (and wallet) will thank you
Also, people play tons of super-high-impact creatures and artifacts, and the Elk that Oko can turn them into is almost completely meaningless in the format