I would have been more safe with the Trias summon and tributed both Refrains and Diviner. You get 2 draws and you have your refrains face up in the extra deck for Vortex to negate the Nibiru. You would sacrifice a Rank 4 but you are pretty much guaranteed to keep your board state. Just a way to bate out Nibiru or any other hand traps.
I would have been more safe with the Trias summon and tributed both Refrains and Diviner. You get 2 draws and you have your refrains face up in the extra deck for Vortex to negate the Nibiru. You would sacrifice a Rank 4 but you are pretty much guaranteed to keep your board state. Just a way to bate out Nibiru or any other hand traps.
People are just so autopilot of tribute diviner they forget it has other effects