Mirror Mirror (Oversized) [Oversize Cards] Xerex and you may spend mana

and you may spend mana as though it were mana of any type to cast those spells

Set: Urza's Saga Type: Enchantment Rarity: Rare Cost: {2}{B}{B} Whenever a creature enters the battlefield

Set: Legends Type: Legendary Land Rarity: Rare All creatures have "At the beginning of your upkeep

its controller adds an additional {G}

Mirror Mirror (Oversized) [Oversize Cards] Xerex and you may spend manaSet: Oversize Cards Type: Artifact Artifact Rarity: Rare Cost: {7} Mirror Mirror enters the battlefield tapped. {7}, {T}, Sacrifice Mirror Mirror: Choose target player. At the beginning of the next end step, exchange life totals with that player, exchange control of all permanents you and that player control, and exchange cards in your hands, cards in your libraries, and cards in your graveyards.