This means when Archpriest of Shadows enters the battlefield, you can put a +1/+1 counter on a creature, and it gains the rest of Archpriest's abilities

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While it is a fairly expensive card, its effect and color made it a must-have for Green decks
Traditionally in Midrange matchups, decks like Azorius Control end up cutting down on spells in favor of creatures, assuming that the Midrange decks cut cards like Go for the Throat in favor of more Duress-esque effects, and planeswalkers
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The uncommon counterspell (two options below) is also very good for limited