Doran, the Siege Tower [Champs and States] Wizard lands tapped for mana produce

lands tapped for mana produce mana of the chosen color instead of any other color

" —Lord Windgrace

Set: Ravnica: City of Guilds Type: Artifact Rarity: Rare Cost: {3} Whenever a nonartifact permanent enters the battlefield under your control

the Nurturer

Set: Tenth Edition Type: Creature — Elf Druid Rarity: Rare Cost: {1}{G} Lands you control have "{T}: Add one mana of any color

Doran, the Siege Tower [Champs and States] Wizard lands tapped for mana produceSet: Champs and States Type: Legendary Creature Treefolk Shaman Rarity: Rare Cost: {W}{B}{G} Each creature assigns combat damage equal to its toughness rather than its power.