Phyrexian unlife isn't poisoning
(Android) During a Brawl game my opponent played Phyrexian unlife, so with Sheoldred the apocalypse and Jin Gitaxias on the battlefield i've cast Peer into the abyss making my opponent target of both copies. My opponent lost ¾ of his/her life, drawed ¾ of his/her library and lost life because of Sheoldred triggers but did't get the poison counters.
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Rezzahan#77802 commented
Because Sheoldred's trigger isn't dealing any damage, it is causing loss of life. So Phyrexian Unlife never applies to give poison counters.