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You have about as many reanimate effects as most Reanimator lists, so why not just play that deck?

The counter-risk is the inability to fight a protracted counter war.

FYI, the deck seems like it's in desperate need of some Grim Tutors.

From the report I read there were multiple occasions where the player couldn't win post-Griselbrand with Tendrils, much less with the ability to win pre-Griselbrand. If that's the case, seems like...

Can this list win without Griselbrand?

If you are Entombing, you should probably have a singular Past in Flames.

Careful Study/Entomb + Chrome Mox is a ton of card disadvantage. You may consider replacing the moxen with Cabal Ritual...