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.
Near Mint - $43.25
Lightly Played - $41.00
Moderately Played - $34.50
Heavily Played - $26.00
Damaged - $21.75
Near Mint Non-English - $43.25
Lightly Played Non-English - $41.00
Moderately Played Non-English - $34.50
Heavily Played Non-English - $26.00
Damaged Non-English - $21.75