Soul Warden | Magic: The Gathering
Formats Soul Warden is Legal in
Official Oracle Text for Soul Warden
Official Rulings for Soul Warden
10/4/2004 : The ability will not trigger on itself entering the battlefield, but it will trigger on any other creature that is put onto the battlefield at the same time.
8/1/2005 : Two Soul Wardens entering the battlefield at the same time will each cause the other's ability to trigger.
8/1/2005 : The life gain is mandatory.