Mulan Imperial General is the second piece of the Ruby-Steel challenge centric gameplan
Fortunately this is not however what MTG: Arena wants you to do and likely for that very reason and so it puts carrots out there for you to get involved in the higher echelons of the games competitive scene and it does this in a number of really clever ways
If you control ten or more treasures at the beginning of your upkeep, you win the game
However, the high mana cost may limit its playability, especially if there are more efficient or versatile options available, such as Experimental Frenzy or Chandra, Torch of Defiance
Sure, it forces your opponents to do the same, potentially refilling their hand with more spells, but also has tons of potential of shuffling away some powerful spell they were holding on to
The lore on each version of this card is different, but the full art version is a beautiful depiction of the Setessan city's lack of walls with the Nessian Forest in the background