The deck could stall specifically the key Lake of the Dead-driven life gain, suppress life total short term, hold off the "pump" Orders with Suq'Ata Firewalker, and eventually finish with a lone Fireball
Blade of Selves, Fury, and Morlun, Devourer of Spiders are especially effective and they aren't hasty creatures
SHRIEKMAW Shriekmaw is probably the elemental I encountered the most of when I first started playing Commander, and for many years basically until Ravenous Chupacabra hit the scene it reigned as one of the better options for an EtB removal spell low on the curve, that could be reanimated when needed
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However, proliferate can affect any number of permanents or players and it adds a counter of each kind already there! It naturally follows that a great proliferate deck would use as many different counters as possible
This format has been fast and punishing, where I feel like every few games, I lose to a card I've never seen before on the bonus sheet