If the spell leaves the stack in any other way, or the permanent it becomes leaves the battlefield, it immediately resumes using its normal characteristics
At least, thats how they run at cEDH tables
While this effect was designed at a time in which mana burn was still a rule of Magic, causing unspent mana to deal damage to its owner, but now it's quite helpful for those looking to access political bargaining chips in the midst of Commander games
To those in need of even more protection, Falco has trained his Brokers in shielding magics, offering them as personal bodyguards and protectors to anyone in New Capenna who can afford it
Bond is an especially fun one if your opponents have goaded tokens in play, lets say from Nettling Nuisance
For now, though, the reliability and flexibility of adventures has once again proven too valuable to be ignored, and thus guaranteed that well be talking about Wilds of Eldraine for many months to come