I managed to create a decent farming deck using Gravekeeper's Vassal. It's not consistent, but if I pull it off I always grab at least 7k points.
I even managed to use it on a Lv. 40 Crowler and nabbed me some bonus objectives! With the point campaign going on I feel a lot more confident in being able to obtain everything I want out of his event. I'm at 2.5M now, so I think I can make it. Only issue is that I need to decide between using my remaining EX jewels between Ancient Gear Workshop (which I have 2 of) and the SR Gemini summoner card that I can't remember the name of (which I have 1 of). I dunno if I can grab another 150 EX jewels before the event ends. I've managed to obtain 3 copies of everything else Crowler has to offer besides his Golem, of course. Well... I technically only have 2 Emes the Infinity cards now, but I think I can get the one being offered for the event.