Nintendo 3DS
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Read+Write feature:
In short: Any Animal Crossing figure (except Villager) plus cards from Series 1, 2, 3, 4, and Promos. (Not compatible with Welcome or Sanrio cards.)
After storing a house design, scanning the amiibo in Animal Crossing: amiibo Festival (Wii U) to place the villager's house on the game board will use the stored house design's exterior.
Sources: Independent research, /u/B0SS_Zombie on Reddit