If you are lucky enough to open a textured foil, you just pulled one of the most valuable cards, and even the base version has a decent price if you don't get the fancy art treatment in your pack
If you were to have a land type count as that color instead, you would allow Mtenda Lions and such, but disallow many more things
Creatures (37) 4 Chief of the Edge 4 Bloodsoaked Champion 4 Mardu Shadowspear 4 Mardu Woe-Reaper 3 Arashin Foremost 4 Dragon Hunter 3 Kytheon, Hero of Akros 3 Thraben Inspector 4 Thalia's Lieutenant 4 Venerated Loxodon Lands (20) Spells (3) Sideboard The main reasons to reach to full Mardu or Abzan Warriors just dont align with the Humans payoffs, so two-color it is
Studious First-Year Studious First-Year is basically Rampant Growth, a solid ramp spell, attached to a 1/1 creature thanks to the prepare mechanic
Ive personally been playing a lot so far with Ixalan and I dont think Ive ever been as confident about a Top 20 list as I am with this one today, but only time will tell how accurate it is