Collector Ouphe

Activated abilities of artifacts can't be activated.

Ayula, Queen Among Bears

Whenever another Bear you control enters, choose one —
• Put two +1/+1 counters on target Bear.
• Target Bear you control fights target creature you don't control.

Kudo, King Among Bears

Other creatures have base power and toughness 2/2 and are Bears in addition to their other types.

Grizzly Bears

Alpine Grizzly

Doorkeeper Thrull

Flash
Flying
Artifacts and creatures entering don't cause abilities to trigger.

Ghostly Prison

Creatures can't attack you unless their controller pays {2} for each creature they control that's attacking you.