Tasigur, the Golden Fang

Delve (Each card you exile from your graveyard while casting this spell pays for {1}.)
{2}{G/U}{G/U}: Mill two cards, then return a nonland card of an opponent's choice from your graveyard to your hand.

Arcane Signet

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

Sol Ring

Assassin's Trophy

Destroy target permanent an opponent controls. Its controller may search their library for a basic land card, put it onto the battlefield, then shuffle.

Swamp

Forest

Island

Command Tower

Exotic Orchard

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