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
The cards curated here by Wizards on Arena are among the best available, so think of the best payoffs for having good mana fixing and ramp
It'll copy any instant and sorcery spell that targets Zada to all your other creatures, which can give massive stat boosts to everything with just one card
That's a lot of use, and this card is arguably better than Opt since you'd rather throw the card into the graveyard that you don't want rather than to the bottom of your library
(The beginning phase includes the untap, upkeep, and draw steps.) When chaos ensues, reverse the game's turn order