When Unclaimed Bird enters the battlefield, if you're on the Mirran team, choose any number of permanents, then remove from each a counter of each kind already there. If you're on the Phyrexian team, proliferate.
NM-Mint - $61.40
Lightly Played - $55.30
Moderately Played - $49.10
Heavily Played - $43.00
Damaged - $30.70
NM-Mint Non English - $61.40
Lightly Played Non English - $55.30
Moderately Played Non English - $49.10
Heavily Played Non English - $43.00
Damaged Non English - $30.70