Text (SM+errata): ~this~ deals 3 damage to each creature without flying if {R} was spent to cast ~this~ and 3 damage to each creature with flying if {G} was spent to cast it. [Oracle 2009/07/08]
You do both if at least one {R} and one {G} were spent on the cost. [Shadowmoor FAQ 2008/04/21]
If this spell is copied, the copy will not have had any mana spent on playing it. [Shadowmoor FAQ 2008/04/21]
