Oblivion Ring

When Oblivion Ring enters, exile another target nonland permanent.
When Oblivion Ring leaves the battlefield, return the exiled card to the battlefield under its owner's control.

Leonin Relic-Warder

When Leonin Relic-Warder enters, you may exile target artifact or enchantment.
When Leonin Relic-Warder leaves the battlefield, return the exiled card to the battlefield under its owner's control.

Copy Enchantment

You may have Copy Enchantment enter as a copy of any enchantment on the battlefield.

Sage of Mysteries

Constellation — Whenever an enchantment you control enters, target player mills two cards.

Altar of the Brood

Whenever another permanent you control enters, each opponent mills a card.

Mirrormade

You may have Mirrormade enter as a copy of any artifact or enchantment on the battlefield.