Updated on May 15, 2021
Here we look at the small number of Test players who saw only victories in their Test careers. As you may guess, this is a short list with only 5 names (who played 5 or more Tests).
Only wins:

The only new entrant here is KA Jamieson with 6 wins out of 6. Other recent players who were briefly on this list after 5 or more Tests include Imran Khan (Jr) and Sam Curran.
It goes without saying that a record like this is more due to being in the right place at the right time rather than the player’s merit.
Above 75% wins:

This is the full list of 36 players who had a win percentage of over 75% after a minimum of 5 Tests.
The highest from India is 5/6 by KK Nair, followed by newcomer Mohammed Siraj with 4/5.
Jamieson, Blundell and Siraj are the only current players here, since KK Nair seems to be unlikely to play for India again. Perhaps TD Astle will add to his 5 Tests for New Zealand.
AC Gilchrist is the only one with over 30 Tests. And the only others with over 20 Tests are Australians from around the same period.