Channel
Sorcery
Until end of turn, any time you could activate a mana ability, you may pay 1 life. If you do, add 
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Richard Thomas
Summer Magic / Edgar (SUM)
• #188Rulings
Once your life total is 0, you can't pay any more life, even if you've somehow not lost the game yet.
(wotc • 2017-11-17)
Rulings
Once your life total is 0, you can't pay any more life, even if you've somehow not lost the game yet.
(wotc • 2017-11-17)