Plains

Sliversmith

{1}, {T}, Discard a card: Create a 1/1 colorless Sliver artifact creature token named Metallic Sliver.

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

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

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

Frontier Bivouac enters tapped.
{T}: Add {G}, {U}, or {R}.

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

Arcane Sanctum enters tapped.
{T}: Add {W}, {U}, or {B}.

Jungle Shrine enters tapped.
{T}: Add {R}, {G}, or {W}.

All Slivers have "{T}: Regenerate target Sliver."

Mystic Monastery enters tapped.
{T}: Add {U}, {R}, or {W}.

Sliver creatures you control have indestructible. (Damage and effects that say "destroy" don't destroy them.)