two card infinite combos mtg with Obira, Dreaming Duelist in EDH New Otter-based Infinite MTG combo

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

Ba Sing Se gives you one that is naturally synergistic with Bristly Bill

Often players would use a card like Tinker to search out any artifact at all, with options that cost far more mana

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It is a creature that functions as a burn blocker