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
Most of that excitement, unsurprisingly, comes from its second ability
It also plays exceptionally well with double-striking Warriors, and it even counts itself if you can somehow slip this 1/3 past an opponent's blockers
Foundry Inspector and Etherium Sculptor turn your artifact creatures into cheaper spells, or even free ones
The ways, for instance, different cards from Sleeping Beauty will accentuate distinct aspects of Princess Auroras personality, or how Lorcana consistently pulls from unexpected places one card, for instance, may reference the tabard from the Mickey Mouse-starring The Three Musketeers, and another may simply point to the Beasts ability to throw a tantrum