I've only really followed NBA basketball for a few years so don't know about the old rivalries in much depth so I'm going to go for the guys who always seem to lead their teams to wins over the Knicks by just being unstoppable offencively.
In no particular order:
Paul Pierce - No matter how well we play against Boston, he always seems to pull something out of the hat.
LeBron James - 50 point games at MSG, big shots and general dominance over the Knicks.
Kobe Bryant - see above.
Ray Allen - multiple late daggers, never seem to defend him well down the stretch when he was a Celtic.
Anderson Varejo - always outrebounds our entire team it seems and is unstoppable in the paint.