Every distinct wording since 2010, newest first.
June 6, 2025 · Final Fantasy
To double the amount of a type of mana in a player’s mana pool, that player adds an amount of mana of that type equal to the amount they already have.
April 27, 2018 · Dominaria
If a spell or ability instructs a player to simply exchange two zones, and one of the zones is empty, the cards in the zones are still exchanged.