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After that though, you could consider a lands-matter sub-theme, playing multiple lands a turn to stack up the triggers

Collector Boosters are where youre most likely to hit the premium versions of those Archive spells (and other Booster Fun variants), and you're guaranteed to find at least three Mystical Archive cards in Collector Boosters

Slayers Stronghold ($2) This is in a lot more decks that you think, and aside from the SL version thats all in black, one of the only special versions out there

Meanwhile, the 1 can combo with Felidar Guardian, but you need an extra piece for this combo to actually do anything (something like Altar of the Brood to take advantage of infinite enters-the-battlefield triggers)

If you do need another card, or want to skip the revealing part, discarding a Vault of Whispers and sacrificing a Dockside Chef puts the necessary card types in your graveyard, and puts Demonic Counsel right in line with Demonic Tutor

Cursed Totem A good sideboard card against the new food based decks and any creature based combo deck like Devoted Druid or Heliod Company