In today's "The Marker" - Thursday March 1, there is a whole article with charts on how much you need to spend with your credit card to get one free ticket on LY.
Buttom line is that AMEX Platinum, MULTI Platinum and MULTI Buisness Gold have the best per shequel rate. For each 350 Shequels you get one Matmid point.
Diners Platinum - 395
Diners - 500
Visa CAL and Leumi Platinum - 700
Isracard Platinum - 1000
Visa Cal, Mastercard Gold - 1500
Multi Gold, AMEX, Isracard - 1600
Leumi Visa Gold - 1750
They even calculated how much you need to spend with each card to get a free ticket to either E. Europe, W. Europe and US/Far East (US is East Coast).
I will try to copy it later form the THE MARKER website.