If Nagato wanted to use [Rinne Rebirth] to resurrect Madara Uchiha, and at his prime, no less...
Then he would have to pay with his own life!
But during the future Fourth Shinobi World War...
Obito Uchiha (controlled by Black Zetsu) used [Rinne Rebirth] to resurrect Madara Uchiha.
He did not die on the spot, and even lived until the final battle.
Obito Uchiha did not die from the cost of using [Rinne Rebirth], but from Kaguya Otsutsuki's [All-Killing Ash Bones]...
Of course.
That also had to do with Obito Uchiha's individual constitution.
"People's constitutions can't all be judged by the same standard..."
Uchiha Minamoto shook his head slightly and sent [Rinne Rebirth] into the [Kamui] dimension.
Actually, with his current physical condition, namely his [Great Sun Sage Body]...
He could absolutely withstand the cost of using [Rinne Rebirth].
The real problem was not the "cost."
It was that [Rinne Rebirth] was an ability exclusive to the [Rinnegan]...
Uchiha Minamoto currently had no [Rinnegan], let alone a [Rinne Sharingan].
All he had was a pair of [Eternal Mangekyō Sharingan].
He did not meet the requirements for using [Rinne Rebirth].
Only someone with a [Rinnegan], even just one [Rinnegan], could use [Rinne Rebirth].
Obito Uchiha had used [Rinne Rebirth] with just one [Rinnegan] to resurrect Madara Uchiha after his [Impure World Reincarnation].
But Uchiha Minamoto could not, at least not yet.
And he had no intention of digging out Nagato's [Rinnegan] and putting them in his own eye sockets just to use [Rinne Rebirth].
What was more...
Good as [Rinne Rebirth] was, it did not fully meet Uchiha Minamoto's requirements.
Uchiha Minamoto first checked the [Heart of Great Love]'s database.
The Kusagakure ninja Ryūzetsu's [Dragon Life Reincarnation] kekkei genkai had long since been fully analyzed by the [Heart of Great Love].