Can an opponent play Deadbloom Predator to a battlefield if Mageseeker Warden is at that battlefield?

Ruling: No, Deadbloom Predator cannot be played to a battlefield where Mageseeker Warden is present. Mageseeker Warden creates a restriction on where units can be played, which follows the "can't beats can" principle where restrictions supersede permissions.

Nuances:

• Mageseeker Warden only restricts where units can be played; it does not prevent moving units from your base to the battlefield
• The card also stops things from becoming ready at that battlefield