Text (10+errata): Whenever a creature enters the battlefield under your control, you gain life equal to its toughness. [Oracle 2009/07/08]
Does not trigger when creatures phase in or change controllers. [DeLaney 1998/10/05]
Does trigger when a creature is put into play by casting or by a spell or ability that puts one into play. [DeLaney 1998/10/05]
Does not trigger on a card in play being turned into a creature. That is just a permanent changing type, not something coming into play. [Barclay 1998/02/28]
