Playing the above cards, in that order, makes all permanents be mana producing lands. It should make them just lands, not tappable for mana (and they're tappable for ANY color mana).

Further, the effect of Toph to make all the newly converted permanents-into-artifacts into lands seems to only last until an earthbending event happens, either Toph's end of turn earthbend or, if you have her out, Avatar Kyoshi's at beginning of combat earthbend. Player can get Toph's effect, removed by an earthbend, back on all cards affected by EM if she's bounced into play (exiled and brought back in, or played anew). In theory, the effect should keep all permanents as artifacts while EM is on the floor, and consequently all permanents are lands if Toph is also on the floor (and were played in that order: EM->Toph).