History of CR 107.14
Every distinct wording since 2010, newest first.
April 27, 2018 · Dominaria
The energy symbol is {E}. It represents one energy counter. To pay {E}, a player removes one energy counter from themselves.
September 30, 2016 · Kaladesh
The energy symbol is {E}. It represents one energy counter. To pay {E}, a player removes one energy counter from himself or herself.
July 17, 2015 · Magic Origins
rule 107.14 not present in this release
May 1, 2014 · Journey into Nyx
The moon symbol appears in the upper left corner of the back face of double-faced cards. See rule 711, “Double-Faced Cards.”
September 30, 2011 · Innistrad
The moon symbol appears in the upper left corner of the back face of double-faced cards. See rule 711, "Double-Faced Cards."
February 1, 2010 · Worldwake
rule 107.14 not present in this release