When you evict someone from a house then buy a new one, you get a parcel from the Mystery Man. He will give you some Toad Swear, Toadstools, Butter and 35 MagiCoins Save the game and evict the Sim/family from that house, Move in to get those items again. Keep doing this to move into Magic Town or to get unlimited Toad Swear, Toadstools, Butter, MagiCoins.