Elemental Mastery | Magic: The Gathering
Formats Elemental Mastery is Legal in
Official Oracle Text for Elemental Mastery
Enchanted creature has ": Put X 1/1 red Elemental creature tokens with haste onto the battlefield, where X is this creature's power. Exile them at the beginning of the next end step."
Official Rulings for Elemental Mastery
5/1/2008 : The tokens will be exiled in the End step even if Elemental Mastery or the enchanted creature has left the battlefield by then.
5/1/2008 : If the ability is activated after the current turn's End step has begun, the tokens won't be exiled until the next turn's End step.