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Only to promptly have them taken out by Earth types, of course

It happens to all of us

Utilizing Benten as well as Cyber Angel Natasha (who can take control of your opponent's monsters if it has been Ritual Summoned and is now in the Graveyard) and Diviner (who, on summon, can send Herald of the Arc Light to your Graveyard, giving you a search for a Ritual monster/spell) generates massive card advantage for the deck and also gives you scope to tailor your end board/hand to whatever your opponent is playing

It has a cumulative upkeep cost of sacrificing a creature

While its technically possible to give a player poison counters directly (Caress of Phyrexia comes to mind), the most popular poison counters strategy involves running a bunch of infect or toxic creatures