Rulings

• 2013-07-01
  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.
• 2013-07-01
  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.
• 2021-03-19
  If a creature has multiple instances of poisonous, each triggers separately.
• 2021-03-19
  A player with ten or more poison counters loses the game as a state-based action, even if no permanents with poisonous are on the battlefield.
• 2021-03-19
  Poisonous 1 causes the player to get just one poison counter when a Sliver deals combat damage to them, no matter how much damage that Sliver dealt.