A permanent or player with hexproof cant be the target of spells or abilities your opponents control
It also doesn't matter if Wound Reflection wasn't on the battlefield at the time some or all of the life was lost.
Limited Resources is a long-running podcast talking all things Magic: The Gathering, and if you want to go real deep, JudgeCast is a deep dive into Magic rules for Magic judges, the officials who run tournaments
The Amethyst/Steel starter deck already has a pretty solid foundation, as it includes many of the Madam Mim and Merlin cards that form the bounce package
Druid of Purification (SLD-877) - Secret Lair Drop (Borderless) Foil Druid of Purification (SLD-877) - Secret Lair Drop (Borderless) Foil Wizards of the Coast This item is like new, pulled from a sealed pack
If you would roll one or more dice, instead roll that many dice plus one and ignore the lowest roll