To summarize, each Doctor Who Commander precon includes: 100 total cards, 50 of which are new-to-Magic, and 50 reprints with new art
In exchange for the raw draw power of Revelation, Krasis creates a sizable body, and the combination of immediate impact and card advantage is always a winner in Standard (see Courser of Kruphix, Tireless Tracker, Collected Company for more examples)
Thirst for Knowledge: At least some of the time, you will be able to draw three cards with Thirst for Knowledge and discard an ther Vial or Grafdigger's Cage, netting you that extra card
But there's also an interesting mechanic, with a little tweak in history that saw lots of competitive play, and thats totem armor
In January of 1994 the Duelists Convocation International was formed, and along with it came sanctioned tournaments and some rule changes
In the super late game, the point at which land draws are basically dead draws, Forbid suddenly starts to gain a lot more value even when used in decks with no engines or intent to abuse the buyback