Demonic Consultation

Standard	Rotated out on November 1, 1997
Pioneer	Not Legal
Modern	Not Legal
Legacy	Banned since October 1, 2000
Vintage	Restricted since October 1, 2000
Commander	Never Banned
Pauper	Never Banned
Oathbreaker	Never Banned
Extended	Rotated out on October 20, 2002

View on Scryfall

Timeline

• June 3, 1995 - Released
• October 1, 2000 - Status changed to Restricted in Vintage
• October 1, 2000 - Status changed to Banned in Legacy
• April 1, 2001 - Status changed to Banned in Extended
• October 20, 2002 - Status changed to Rotated in Extended

Rationale

Demonic Consultation was banned or restricted in various formats that already banned other powerful tutors. Its efficiency outweighed the inherit risks of the card.