Avenger of Aragos

Avenger of Aragos enters the battlefield with
X +1/+1 counters on it where X is the
amount of creatures target opponet controls.
{2}: Remove a +1/+1 counter from Avenger of Aragos, you draw a card and gain 2 life.
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After the death of Aragos by Phaknax's blade, his army captuilated, leaving Theros undefended...