Rule 119.8 · Life

If an effect says that a player can’t lose life, that player can’t make an exchange such that the player’s life total would become lower; in that case, the exchange won’t happen. Similarly, if an effect redistributes life totals, a player can’t receive a new life total such that the player’s life total would become lower. In addition, a cost that involves having that player pay life can’t be paid.

Other rules in this chapter

Ask the judge Pro

The life counter has an AI judge that answers your play citing the exact rules. It is part of Gatewatch Pro; the rules, Oracle text and rulings stay free.