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You already have this for your EDH deck if it fits, most likely
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
The version above, with adorable art from Mizutametori, is only available at Commander Box League or Two-Headed Giant Commander night events from November 21st to January 15th
This count includes colorless, all five mono-colors, ten two-color guilds, ten three-color shards and wedges, five four-color combinations, and one five-color option
It fits well into the new Eldrazi decks that help double triggers, and it also comes down cheaply with Sami, Wildcat Captain from Edge of Eternities