Faveur du lumaret

The copy will have the same target as the original spell unless you choose a new one. If the target is illegal but you can't choose a new legal target, it remains unchanged.

The infusion ability will trigger when you cast Lumaret's Favor regardless of whether you've gained life this turn. As that ability resolves, it will check to see if you've gained life this turn. If you have, Lumaret's Favor will be copied once.