As Ixidron enters the battlefield, turn all other nontoken creatures face down. (They're 2/2 creatures.)
Ixidron's power and toughness are each equal to the number of face-down creatures on the battlefield.
NM-Mint - $0.90
NM-Mint Non English - $0.90
Lightly Played - $0.80
Lightly Played Non English - $0.80
Moderately Played - $0.80
Moderately Played Non English - $0.80
Heavily Played - $0.70
Heavily Played Non English - $0.70
Damaged - $0.60
Damaged Non English - $0.60