Channel

Sorcery    (CMC:2)

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.

2E • ENRichard Thomas

™ & © 1993—1993 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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