Overabundance

Enchantment, 1RG (3)
Whenever a player taps a land for mana, that player adds one mana to his or her mana pool of any type that land produced, and Overabundance deals 1 damage to him or her.¹
Illus. Ben Thompson

Gatherer Card Rulings [Nov 2009]

• 10/4/2004: The ability deals one damage even if the land produces no mana when it was tapped to use a mana ability. This can happen with lands that produce a variable amount of mana.
• 10/4/2004: This card's ability is a mana ability. There is no chance to respond to it in order to prevent the damage. If you want to prevent the damage, you need to use a prevention spell or ability prior to tapping the land for mana.

Format Legality	Legal in Vintage, Legacy, MTGO Classic Banned in Extended, Standard
Printings (1/6)	Invasion (Rare)