Hushbringer

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

Archivist of Oghma

Flash
Whenever an opponent searches their library, you gain 1 life and draw a card.

Flash
If a nontoken creature would enter and it wasn't cast, exile it instead.

All artifacts have "At the beginning of your upkeep, sacrifice this artifact unless you pay {1}."

First strike
Noncreature spells cost {1} more to cast.

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

Noncreature spells with mana value 4 or greater can't be cast.
Noncreature spells with {X} in their mana costs can't be cast.