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Unlike Mairsil combos, which required the setup of putting things into exile, Quicksilver Elemental just works with Vivi Ornitier

You can still have poison counters put on you in other ways though, most notably through frequent proliferation

Sector assignment isn't copiable

However, at 1G it competes with extremely efficient staples like Scavenging Ooze (which gains life and grows itself), Tarmogoyf (raw efficiency), or Voice of Resurgence (board presence and resilience), and in dedicated counter decks cards like Conclave Mentor or Hardened Scales often provide more synergy value, while in lifegain strategies Ajanis Pridemate or Trellessara, Moon Dancer may scale faster for similar cost