Vara's Sanctum +
Black-Sky Harbinger = consistent board wipe
Yetipult is also a viable substitute sometimes.
Tome of Horrors is in the deck, not just as an alternate win condition, but in order to help
Essence Feast become another board wipe.
Dark Wisp and
Medibot Station are there to help delay aggro decks as well as help you get to your gas faster.
I only occasionally bring this deck to Throne matches. It served as a good Gauntlet deck for a long time. There's probably some ideas in here that might be useful when Expedition changes again. It was initially based off of a deck from before Expedition was a format, but I don't remember the deck name at all, lol.