The deck is absolutely going to be high risk, possible higher reward and I think this Phyrexian will absolutely entice the audience its meant for
Instant Rescue from the Underworld As an additional cost to cast this spell, sacrifice a creature
She also has an activated ability that costs 2/U 2/B 2/R 2/G, which lets you look at the top six cards of your library, reveal up to two wizard, warrior, cleric, rogue, and/or ally creature cards and put those into your hand (were gonna skip the allies today, sorry friends)
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The unique wordings associated with older poison cards versus newer infect cards determines the answer to this question: Poisonous creatures kill you with normal damage before the poison trigger has a chance to resolve while infect creatures dont