
Surveil 2, then choose an instant or sorcery card in your graveyard. You may cast it this turn. If that spell would be put into your graveyard, exile it instead. (To surveil 2, look at the top two cards of your library, then put any number of them into your graveyard and the rest on top of your library in any order.)
Mission Briefing has 4 printings, first in Guilds of Ravnica (2018). EDHREC ranks it #4,938 among Commander cards. It appears most in Mirko, Obsessive Theorist decks (5,934 on EDHREC). 1 public deck on TCG runs it. It has 6 official rulings.
Deck counts from EDHREC.
Cards that show up in the same decks on EDHREC.