Channel

Sorcery    (CMC:2)

Until end of turn, you may add colorless mana to your mana pool at a cost of 1 life per point of mana. These additions are played with the speed of an interrupt. Effects that prevent or redirect damage may not be used to counter this loss of life.

3E • ENRichard Thomas

™ & © 1993—1994 Wizards of the Coast

Legal in: Freeform,Prismatic,Singleton 100

Oracle Text (click to copy):

Channel {G}{G} Sorcery Until end of turn, any time you could activate a mana ability, you may pay 1 life. If you do, add {C} to your mana pool.

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10/4/2004
You can't pay life you don't have. In other words, you can't Channel yourself below zero life.

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