The Amalgam the Trials

Whenever a creature dies, put a +1/+1 counter
on The Amalgam the Trials and an amalgam
counter on that card.
When The Amalgam the Trials dies, Return
each card with an amalgam counter on it from
all graveyards to the battlefield under your
control.

With the mystical barrier protecting the city gone,
an entity crawled its way from the wastes.