You need to be in the top 15 in total playoff Defensive Win Shares and the top 15 in total playoff Offensive Win Shares to qualify.
Only 8 guys qualify - two of whom will be playing tonight.
8th best - Larry Bird (9th most DWS and 15th most OWS) = 24 points (lower is better)
7th best - LeBron James (14+7) = 21 points
6th best - Magic Johnson (15+2) = 17 points
5th best - Shaq (10+6) = 16 points
4th best - Wilt (2+11) = 13 points
3rd best - Tim Duncan (3 + 9) = 12 points
2nd best - Kareem (5+3) = 8 points
1st - Michael Jordan (6 + 1) = 7 points