Fellwar Stone

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

Queza, Augur of Agonies

Whenever you draw a card, target opponent loses 1 life and you gain 1 life.

You have no maximum hand size.
{T}: Add {C}.

Exile target creature. Its controller may search their library for a basic land card, put that card onto the battlefield tapped, then shuffle.

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

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

Exile target creature. Its controller gains life equal to its power.