I've found when you do a 99 Lottery shot... more often than not you'll end up with at least 1 four star. That's 990 Gran.
Your other options are to save gran from your weekly payouts and daily MM to get the 2100 to get a box (can take a few weeks but far less than 40 point cards). If you get 50 a week from payouts and 70 a week from MM it would take about 17 weeks. But that's just a bad estimate. Just from payouts of 100 a week (50 winning games give or take since unless you can do a 50 game streak it'll take more than just 50 games) it would take you 12 weeks give or take.
Granted that's a lot of time invested but you will get some point cards in the meantime.
Also Enter CotF and AtC. You stand the potential of getting grand/point cards there. Speaking from experience your deck doesn't have to be amazing to win. If you can make it work AND win that's 10 extra point cards.