A lot of design is reacting to an environment and crafting the things that will make that environment robust
Although they dont have flash themselves, these powerful cards more than make up for it
It doesnt take much to turn an overloaded Rift into a win, especially since your non-green opponents need to rebuild their mana and creatures
This means she works better with instant spells you can cast from the graveyard on your opponents' turns (Think Twice) but it's also worth adding ways to cast your sorceries at instant speed as well, such as Teferi, Time Raveler, so you can copy those spells on your opponents' turns as well
Not possible to tap Wild Cantor and then gain mana off it
But something like Zetalpa isn't cheap for Sun Titan or the Reclamation to bring back, has no mad synergy you want, or even something tangential like Pristine Angel and Pristine Skywise