Nature's Lore

Search your library for a Forest card, put that card onto the battlefield, then shuffle.

Azorius Signet

Three Visits

Search your library for a Forest card, put it onto the battlefield, then shuffle.

Sol Ring

Farseek

Search your library for a Plains, Island, Swamp, or Mountain card, put it onto the battlefield tapped, then shuffle.

Selesnya Signet

Plains

Arcane Signet

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

Simic Signet

Talisman of Progress

{T}: Add {C}.
{T}: Add {W} or {U}. Talisman of Progress deals 1 damage to you.

Talisman of Unity

{T}: Add {C}.
{T}: Add {G} or {W}. Talisman of Unity deals 1 damage to you.

Arcades, the Strategist

Flying, vigilance
Whenever a creature you control with defender enters, draw a card.
Each creature you control with defender assigns combat damage equal to its toughness rather than its power and can attack as though it didn't have defender.