Its possible its not quite good enough, but worth testing
The ability to convoke it means you just need to tap a few creatures to cast it for free, and with enough black Wizards from Final Fantasy lying around, you're likely going to do just that
Lazav, the Multifarious is there to reach any creatures you may have milled while Devourer of Memory provides a low cost on field threat
Terrasymbiosis performs best in strategies that place counters on multiple turns : including through combat, activated abilities, or modular effects
Cards like Skrelvs Hive, Mirrex, Reject Imperfection, and Bring the End would all enhance the power of this card as a control finisher and sweeper in competitive play
It's similar to other bonus sheets like Breaking News from Outlaws of Thunder Junction and Enchanting Tales in Wilds of Eldraine