A search of the civil registration death records at the free irishgenealogy.ie website does not show the death of a Michael Magnier/Magner of Ballyvisteen for the year 1877.
If he died in Ballyvisteen, Civil Parish of Kildorrery, his death would have been recorded in the Mitchelstown Registration District.
According to the IreAtlas Townland Data Base, Ballyvisteen was in the Civil Parish of Kildorrey and the PLU (Poor Law Union) of Mitchelstown, based on those towns that were recorded in the 1851 Ireland census. See the IreAtlas entry at: https://is.gd/Iomp7G
I expanded the search at irishgenealogy.ie for Michael’s death under the name Magnier and Magner and found one death record for a Michael “Magner,” who died in Ballyvisteen on March 6, 1883 at the age of 55. At the time of death he was a bachelor. His occupation had been farmer. The cause of death was, “Unknown. No Med. attend,” that is, “No Medical attendant.”
The person who reported Michael’s death to the registrar was his brother James, whose residence is Ballyvisteen. The registrar, C. Buckley, recorded the death in the Mitchelstown Registration District on March 13, 1883. Michael’s death is the last entry in the death register, Number 275. The death record is the last entry in the death register, Number 275 at: https://is.gd/LH9qay
Indications are, the 1877 death of Michael Magnier was not reported to the registrar.
By the 1901 Irish census there were two Magnier households and one Magner household recorded in the townland of Ballyvisteen. See Ballyvisteen house numbers 1, 4, and 6 in the 1901 census from the National Archives of Ireland website link: https://is.gd/E1gmFr
With Kind Regards,
IreAtlas Townland Data Base
1901 census, National Archives of Ireland