Channel (2ED) from Unlimited Edition, available at 401 Games Canada.

• Rarity: Uncommon
• Finish: Normal
• Artist: Richard Thomas
• Card Text:
  Until end of turn, you may add colorless mana to your mana pool, at a cost of 1 life each. These additions are played with the speed of an interrupt. Effects that prevent damage may not be used to counter this loss of life.