Les cinq cartes Skycloud Expanse, Darkwater Catacombs, Shadowblood Ridge, Mossfire Valley et Sungrass Prairie, de l'édition Odyssey, ainsi que les cinq cartes Desolate Mire, Ferrous Lake, Viridescent Bog, Sunscorched Divide et Overflowing Basin, de l'édition Fallout, forment un cycle de terrains appelé "Filterlands".

Source ("Next is a land cycle. Design's version of this cycle is similar to what was printed with one key difference: these lands let you sacrifice the land to add one of the two colors of mana and draw a card. We included it to support threshold as much as we could. [...] In the end, the lands were too good with that ability and the set didn't need the extra sacrifice, so it was removed during development.")