I played two (count them!) matches with a similar list to @wfain RUGb from a few posts up and it felt pretty good. I happened to play back to back against the same Lands player, first with a Bant list and then this one and the Deathrites really helped. My second match was vs. Esper Outcome and he stumbled a bit, Null Rod did some work and I got there.
So apparently Spellseeker will be online a week from today: https://twitter.com/DrStreetmention/status/1042684448179773440
I was thinking of a straight BUG version to maximize Deathrite and Leovold as a plan C. Null Rod is an acceptable substitute for Stony Silence but losing out on Thalia along with Ancient Grudge, Chewer and Pyroblast from other versions feels like it might be bad but I'm looking forward to trying it out. Maybe with a few Missteps or something as additional maindeck disruption.