wotc
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.
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.
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.
If a creature has multiple instances of poisonous, each triggers separately.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Franz Vohwinkel
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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.