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
Chances are pretty good youll get sufficient value out of one side of this card to make it worth playing
Now our opponents chump blocking provides value
Yes, Zombies are one of the marquee creature types of Magic and just like Elves, Goblins and Humans, their rotten tribe has grown to include any niche effect you can imagine, along with multitudinous powerful lords and tribal payoffs
Its an instant, so you have much more flexibility over when you cast itfor example, in response to a reanimation spell or targeted graveyard hate like Cling to Dust