Answered May 17th, 2019

Giannis Antetokounmpo is just the sixth different player to post at least 30p/15r/5a in a conference finals game since 1965.

Who was the last player with 30 points, 15 rebounds and 5 assists in a conference finals game?

Interpreted as:

Who was the last player with 30 or more points, 15 or more rebounds and 5 or more assists in a conference finals game?