Russell Westbrook had the most games in the playoffs with 10+ rebounds, 50+ points and 10+ assists, with 1 game.

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most games in playoffs with 50 points 10 rebounds and 10 assists by a player
Interpreted as:
most games in playoffs with 50 or more points 10 or more rebounds and 10 or more assists by a player
NAMEGPPTSREBASTMPGPPGRPGAPGSPGBPGTPGFGMFGAFG%3PM3PA3P%FTMFTAFT%MINSTLBLKTOVPF+/-
Russell WestbrookRussell Westbrook151101341.451.010.013.04.01.04.017.043.039.52.011.018.215.018.083.3414143+11
StatMuse has game-level data for assists going back to the 1965 playoffs.