This came up in a separate game this past Friday when the Sliver deck attacked with two Predatory Slivers, one Thorncaster Sliver, and two Manaweft Slivers while his opponent had a Blood Artist as well as some 2/2.
The reason this even came up was because, if the triggers went on the stack, you could target things so they resolve in the following order:
- Predatory Sliver targets Blood Artist, killing it.
- Predatory Sliver targets the 2/2, dealing one damage to it.
- Thorncaster Sliver targets the 2/2, killing it.
- and 5. Both Manaweft Slivers target the player, dealing one damage each to him.