In other words, Proliferate lets you put more good counters on your cards which already have good counters on them, and put more bad counters on your opponents stuff with bad counters
Often players would use a card like Tinker to search out any artifact at all, with options that cost far more mana
Youve been warned
If you want to try to kill me in 2021 by putting Progenitus into your aggro deck, more power to you
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