Collector Ouphe

Activated abilities of artifacts can't be activated.

Leonin Arbiter

Players can't search libraries. Any player may pay {2} for that player to ignore this effect until end of turn.

Your opponents can't cast spells from anywhere other than their hands.

Flying
Whenever a permanent entering causes a triggered ability to trigger, counter that ability unless its controller pays {2}.

Flying, lifelink
Creatures entering or dying don't cause abilities to trigger.