Lotus Petal [Tempest]Set: Tempest Type: Artifact Rarity: Common Cost: {0} {T}, Sacrifice Lotus Petal: Add one mana of any color. "Hard to imagine," mused Hanna, stroking the petal, "such a lovely flower inspiring such greed."

Gitaxian sective

Set: Judge Gift Cards 2010 Type: Land Rarity: Rare Thawing Glaciers enters the battlefield tapped

Set: Amonkhet Invocations Type: Sorcery Rarity: Mythic Cost: {3}{W} Destroy all lands

Set: Magic Player Rewards 2007 Type: Instant Rarity: Rare Cost: {1}{W} Destroy target artifact or enchantment

you may draw two additional cards

Set: Fifth Dawn Type: Artifact — Equipment Rarity: Uncommon Cost: {0} Equipped creature has "{T}: Add one mana of any color

Set: Tenth Edition Type: Artifact Rarity: Rare Cost: {2} {3}

but not for a way to control it

"Fools dig for water

"I'd call that a successful first test

Set: Judge Gift Cards 2004 Type: Creature — Human Druid Rarity: Rare Cost: {1}{G} {G}

destroy all non-Wall creatures that player controls that didn't attack this turn