Rakdos Signet

Arcane Signet

{T}: Add one mana of any color in your commander's color identity.

Luxury Suite enters tapped unless you have two or more opponents.
{T}: Add {B} or {R}.

Menace
Whenever Obeka, Splitter of Seconds deals combat damage to a player, you get that many additional upkeep steps after this phase.

{T}: Add one mana of any color that a land an opponent controls could produce.

Equipped creature has hexproof and haste. (It can't be the target of spells or abilities your opponents control.)
Equip {1}

Equipped creature has haste and shroud. (It can't be the target of spells or abilities.)
Equip {0}

Drowned Catacomb enters tapped unless you control an Island or a Swamp.
{T}: Add {U} or {B}.

Training Center enters tapped unless you have two or more opponents.
{T}: Add {U} or {R}.

Morphic Pool enters tapped unless you have two or more opponents.
{T}: Add {U} or {B}.