History of CR 901.15a

Every distinct wording since 2010, newest first.

May 3, 2019 · War of the Spark
As an alternative option, a Planechase game may be played with just a single communal planar deck. In that case, the number of cards in the planar deck must be at least forty or at least ten times the number of players in the game, whichever is smaller. The planar deck can’t contain more phenomenon cards than twice the number of players in the game. Each card in the planar deck must have a different English name.
January 25, 2019 · Ravnica Allegiance
As an alternative option, a Planechase game may be played with just a single communal planar deck. In that case, the number of cards in the planar deck must be at least forty or at least ten times the number of players in the game, whichever is smaller. The planar deck can't contain more phenomenon cards than twice the number of players in the game. Each card in the planar deck must have a different English name.
February 1, 2014 · Born of the Gods
As an alternative option, a Planechase game may be played with just a single communal planar deck. In that case, the number of cards in the planar deck must be at least forty or at least ten times the number of players in the game, whichever is smaller. The planar deck can’t contain more phenomenon cards than twice the number of players in the game. Each card in the planar deck must have a different English name.
July 1, 2012 · Magic 2013
As an alternative option, a Planechase game may be played with just a single communal planar deck. In that case, the number of cards in the planar deck must be at least forty or at least ten times the number of players in the game, whichever is smaller. The planar deck can't contain more phenomenon cards than twice the number of players in the game. Each card in the planar deck must have a different English name.
February 1, 2010 · Worldwake
rule 901.15a not present in this release