Arcane Signet

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

Simic Signet

Lands you control have "{T}: Add one mana of any color."
{T}: Add one mana of any color.

{T}: Add one mana of any color in your commander's color identity.
Sacrifice Commander's Sphere: Draw a card.

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

{T}, Sacrifice Evolving Wilds: Search your library for a basic land card, put it onto the battlefield tapped, then shuffle.

{3}, Sacrifice Burnished Hart: Search your library for up to two basic land cards, put them onto the battlefield tapped, then shuffle.

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

{T}, Sacrifice Terramorphic Expanse: Search your library for a basic land card, put it onto the battlefield tapped, then shuffle.