Still, Amy has some unique capabilities here on display, and some important abilities for this type of deck
If you want to try to kill me in 2021 by putting Progenitus into your aggro deck, more power to you
Ba Sing Se gives you one that is naturally synergistic with Bristly Bill
Ademi of the Silkchutes Agent of the Shadow Thieves Ajani's Presence Akiri, Fearless Voyager Akroma's Will And They Shall Know No Fear Angelic Guardian Archangel Avacyn Azlask, the Swelling Scourge Bant Basri Ket Bast, Panther Goddess Bleeding Effect Blizzard Brawl Bonds of Mortality Boromir, Warden of the Tower Break of Day Bulwark Ox Campsite Cuisine Captain America, Skybound Cecil, Redeemed Paladin Dauntless Escort Destined // Lead Divine Resilience Duty Beyond Death Elspeth, Knight-Errant Endurance Bobblehead Ephemeral Shields Etchings of the Chosen Everybody Lives
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
