Amass 1, then proliferate. (To amass 1, put a +1/+1 counter on an Army you control. If you don’t control one, create a 0/0 black Zombie Army creature token first. To proliferate, choose any number of permanents and/or players, then give each another counter of each kind already there.)

For each Eternal killed by the planeswalkers, a lot more came from Amonkhet through Bolas’s portal.

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