5 for me.
In a normal BTT draft I will take this P1p1 and build the deck around it (assuming no foil rare/mythic). Pretty much this just wins the game on the spot. Given the high toughness of
creatures and the ability that deck has to resist the aggro decks, this allows you to win very quickly.
Imagine the entirely plausible:
Turn 2 - Returned Phalanx or Omenspeaker (both common both going to be in any UB control deck)
Turn 3 - Servant/Adept/Triton/Oak (basically a whole load of cards with a minimum toughness of 3)
Turn 4 - Returned Centaur (mills 4 for bonus).
Turn 5 - God (mill 10)
Turn 6 - Even without playing anything mill 10
Assume your opponent starts with 33 cards in the library. By turn 6 he has drawn at least 5 cards so he has 28 tops and you've milled 24. That's game.
This is not a 'God' draw (no pun) except for the God on turn 5. All of the other cards have multiple options and are easily replaceable.