Channel

Sorcery    (CMC:2)

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

TODO 3E2 • ENRichard Thomas

™ & © 1993— Wizards of the Coast

Notes: TODO: Check rarity

Legal in: Freeform,Prismatic,Singleton 100

Oracle Text (click to copy):

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