1 Feb 2007
Note that the first ability can affect any kind of creature, but the second ability can affect only Slivers. Both abilities can affect players.
1 Jul 2013
Abilities that Slivers grant, as well as power/toughness boosts, are cumulative. However, for some abilities, like flying, having more than one instance of the ability doesn't provide any additional benefit.
1 Jul 2013
If the creature type of a Sliver changes so it's no longer a Sliver, it will no longer be affected by its own ability. Its ability will continue to affect other Sliver creatures.