Shriekmaw

Artifacts you control have hexproof. (They can't be the targets of spells or abilities your opponents control.)

W, T: Regenerate target artifact.

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

Exile target creature. Its controller may search their library for a basic land card, put that card onto the battlefield tapped, then shuffle.

Flying When this creature enters, you may return target artifact card from your graveyard to your hand.

Each noncreature artifact is an artifact creature with power and toughness each equal to its mana value. (Equipment that's a creature can't equip a creature.)

U, T, Return an artifact you control to its owner's hand: You may put an artifact card from your hand onto the battlefield.

Put target creature on top of its owner's library, then fateseal 2. (To fateseal 2, look at the top two cards of an opponent's library, then put any number of them on the bottom of that player's library and the rest on top in any order.)