Imposing Sovereign

Creatures your opponents control enter tapped.

Eidolon of Rhetoric

Each player can't cast more than one spell each turn.

Flash
Flying
Creatures entering don't cause abilities to trigger.

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

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

Creatures entering don't cause abilities to trigger.