Mission Briefing will be good not only in Surveil-based decks, but in any other blue decks that would like to have more than four copies of Snapcaster Mage
Sakashima's Student Clone effects are very strong, but clone effects like Sakashima's Student that you can flash in with ninjutsu can instantly steal a game
If youd like to make things a little bit more fair, Aven Mindcensor can restrict your opponents to looking at just the top 4 cards of their library
That said, it is a battle, it's cheap, and it fills the graveyard, which could be relevant in decks with a card-type-matters theme built around Atraxa, Grand Unifier or Tarmogoyf
While its risky, the chance to swing a game in your favor for just a few mana is very tempting
Raichu Prime This one is actually used in an existing lower-tier deck with Eelektrik, and it won a few small tournaments as a cheaper version of Zekeel and Raikou/Eels