Golgari Signet

Gruul Signet

Rootborn Defenses

Populate. Creatures you control gain indestructible until end of turn. (To populate, create a token that's a copy of a creature token you control.)

Illusionist's Bracers

Whenever an ability of equipped creature is activated, if it isn't a mana ability, copy that ability. You may choose new targets for the copy.
Equip {3}

Izzet Signet

Junktroller

Defender
{T}: Put target card from a graveyard on the bottom of its owner's library.

Orzhov Signet

Pariah's Shield

All damage that would be dealt to you is dealt to equipped creature instead.
Equip {3}

Rakdos Signet

Seal of the Guildpact

As this artifact enters, choose two colors.
Each spell you cast costs {1} less to cast for each of the chosen colors it is.

Selesnya Signet

Silent Dart

{4}, {T}, Sacrifice this artifact: It deals 3 damage to target creature.

Simic Signet

Summary Judgment

Summary Judgment deals 3 damage to target tapped creature.
Addendum — If you cast this spell during your main phase, it deals 5 damage instead.

Sword of the Paruns

As long as equipped creature is tapped, tapped creatures you control get +2/+0.
As long as equipped creature is untapped, untapped creatures you control get +0/+2.
{3}: You may tap or untap equipped creature.
Equip {3}

Voyager Staff

{2}, Sacrifice this artifact: Exile target creature. Return the exiled card to the battlefield under its owner's control at the beginning of the next end step.

Ravnica Remastered