Earlier within the recreation an Infinity Elemental was given Lifelink and dealt injury, giving me infinite life. I’ve a Form of the Dragon in play, in order that at my finish step my life complete turns into 5.

Rule 119.5 states

If an impact units a participant’s life complete to a selected quantity, the participant positive aspects or loses the required quantity of life to finish up with the brand new complete.

The ruling on Infinity Elemental states

If an Infinity Elemental you management positive aspects lifelink and offers injury, you’ll then have infinite life. From that time on, your life complete successfully can’t change. If you lose life, you’ll nonetheless be at infinite life. You will pay any quantity of life and nonetheless be at infinite life. In reality, you may be hit by an opposing Infinity Elemental and nonetheless be at infinite life.

On one hand, “the required quantity of life to finish up with the brand new complete” appears to point that I need to find yourself at 5 life, however the ruling appears to point that not even an infinite lack of life can change my life complete (infinity minus infinity being mathematically undefined apart). Which one controls?