Blade of Selves, Fury, and Morlun, Devourer of Spiders are especially effective and they aren't hasty creatures
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
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
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I quite like Gladiolus Amicitia, as it has huge stats, free value, and a powerful trample ability
Honorable mentions As usual I have a few more options that didnt make the cut that obviously you can ask me about either here or on my personal blog