While you can have a figure present, try and make sure the figure is secondary to the landscape
Niv-Mizzet was an entirely new animal
For the most part, these function the same as sagas normally do, giving you chapter abilities for each turn that they remain in play, except they can also attack and block just like normal creatures
Mirage Mirror can turn into a duplicate land, but a lot of the time you'll want that land to be producing mana, and the mana cost on Mirrage Mirror's ability doesn't leave much profit
This is obviously pretty hard to set up in Constructed decks, where you're limited to four copies per card, and it's even more useless in singleton formats like Commander with a few obvious exceptions
The only other name that might have been more on the nose was Kids of the Crop, but thankfully Magics designers were more creative than that