Ive done this before in recent years, but given that this is the culmination of the Bolas story arc, now is the time to do it right
10 Kasla, The Broken Halo Everyone Helps Out A bit of a neat twist on themes that feel very kindred-like, Kasla, the Broken Halo is a very neat card that instead of following a creature type instead rewards you for playing a specific mechanic, convoke
Cabal Coffers, Maze of Ith, Dark Depths, Glacial Chasm, Ghost Quarter, Kor Haven, Inventors Fair all of them turn into rainbow lands that cant do anything else when Toxicrene hits the field
If the Desert leaves your graveyard before the delayed triggered ability created by Desert Warfare's first ability resolves, that Desert won't be put onto the battlefield from its new zone when that ability resolves