Ragged Playmate is another simple one, a 2/2 that can be tapped to prevent another creature with up to 2 power from being able to block for the rest of the turn, as if it helps hold something down while its friends wreak more havoc
Three Star cards have just over a 1% chance to appear in packs, but only one is available in each type of pack
Unfortunately, again, Horrifying Revelation requires that the same player discarding a card be the player to mill a card, and milling just one card is so minimal in value even clearing the top for a Halimar Depths or Jace is rarely worth two cards
Speaking of power creep: in Onslaught Limited and Khans of Tarkir Limited, it was generally okay to make your first play on turn three by casting a morph
But even without all the support backing up Rampaging Ferocidon, it on its own can shut down a lot of plays
Oona, Queen of the Fae The queen and mother of the fae of Lorwyn, Oona, Queen of the Fae is a powerful (if expensive) card to cast