Magic Johnson had the most games in the playoffs with 10+ assists, with 143 games.

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most career playoff games by a player with 10 or more assists
JohnsonStocktonNashKiddRondoJamesPaulJohnsonThomasWestbrookJacksonCheeksRobertsonWilliamsJohnsonBirdWestDrexlerHardenNixonJordanJohnsonWallMooreFrazier1431005450494948484836312525242424232221212018171717
NAMEGPASTMPGPPGRPGAPGSPGBPGTPGFGMFGAFG%3PM3PA3P%FTMFTAFT%MINPTSREBSTLBLKTOVPF+/-
Magic JohnsonMagic Johnson1432,00939.919.07.514.01.90.33.76.613.349.80.31.124.05.56.584.55,7122,7131,06827549525392
John StocktonJohn Stockton1001,32739.215.63.613.32.30.33.25.511.447.70.82.235.33.94.783.93,9241,56036323031320305+241
Steve NashSteve Nash5467739.419.53.912.50.40.13.67.115.046.91.54.137.93.94.291.32,1291,054209248195114+295
Jason KiddJason Kidd5060540.613.87.612.11.90.33.25.213.239.31.34.528.02.12.974.32,0326883789717162127+208
Rajon RondoRajon Rondo4964541.315.77.113.22.20.23.26.213.945.00.51.533.32.74.165.72,02376834611011157123+322
LeBron JamesLeBron James4956542.328.810.111.51.51.03.410.421.648.31.75.132.86.28.771.32,0711,4114957547167115+404
Chris PaulChris Paul4856738.621.64.911.82.20.12.57.816.347.61.64.140.54.45.285.51,8541,0352341055120140+165
Kevin JohnsonKevin Johnson4860840.921.93.612.71.40.33.87.515.847.70.30.927.96.67.884.91,9641,0501756615183110-5
Isiah ThomasIsiah Thomas4856239.518.14.811.72.10.43.56.515.342.50.72.034.04.55.876.41,89887122910120167161
Russell WestbrookRussell Westbrook3643838.725.37.912.22.10.44.38.420.840.11.54.831.07.18.385.31,3939102847613156105+207
Mark JacksonMark Jackson3137834.610.74.612.21.20.12.53.88.943.31.02.637.52.12.777.41,0723331423647662+160
Maurice CheeksMaurice Cheeks2528241.415.74.411.30.46.211.653.60.00.20.03.34.279.81,0353931101068
Oscar RobertsonOscar Robertson2529520.05.211.80.80.27.416.844.45.25.889.05011295176
Deron WilliamsDeron Williams2428342.222.03.211.81.20.33.66.915.046.01.74.141.46.47.881.91,013527762988674+17
Dennis JohnsonDennis Johnson2428043.518.74.211.71.00.32.37.316.344.80.21.217.23.94.880.91,0444481002585679
Larry BirdLarry Bird2427843.222.110.811.60.78.218.444.30.62.426.35.25.987.31,0365312581772
Jerry WestJerry West2328942.531.14.812.611.523.648.78.29.783.997771611071
Clyde DrexlerClyde Drexler2224741.023.47.111.22.51.03.08.617.748.70.72.626.35.47.175.890351415754236575
James HardenJames Harden2123937.626.26.011.42.10.84.47.618.042.43.19.333.37.99.087.378955012744169269+127
Norm NixonNorm Nixon2124741.418.03.411.80.17.716.546.40.20.450.02.53.082.587037772378
Michael JordanMichael Jordan2022642.433.26.111.32.71.04.312.223.751.60.82.139.08.09.683.884866412154208667
Avery JohnsonAvery Johnson1821641.012.92.812.01.70.22.35.211.246.80.10.1100.02.43.568.3738232513044139+39
John WallJohn Wall1722139.522.54.613.01.91.14.18.019.740.61.13.926.95.46.582.96723827933197037+97
Johnny MooreJohnny Moore1724036.217.64.514.12.40.52.27.513.954.20.40.940.02.23.270.4615300774193862
Walt FrazierWalt Frazier1720543.121.88.012.18.715.755.44.45.973.373337013644
StatMuse has game-level data for assists going back to the 1965 playoffs.