Historical Rules · 30 September 2011
Rule 901.5
Official source text from the 30 September 2011 Rules release
Once all players have kept their opening hands and used the abilities of cards that allow them to start the game with those cards on the battlefield, the starting player moves the top card of his or her planar deck off that planar deck and turns it face up. (See rule 103.6.) No abilities of that card trigger as a result.