Deathform Duo

Undying (When this creature dies, if it had no
+1/+1 counters on it, return it to the battlefield under its owner’s control with a +1/+1 counter on it.)

When Deathform Duo enters, it becomes a copy of another target creature you control until the end of your next turn.
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“Adaptable,” the shapeshifter whispered. “Deathless,” the zombie growled.