If another effect (or effects) modifies how much damage a source you control of the chosen type would deal (for example, by preventing some of that damage), the player being dealt damage or the controller of the permanent being dealt damage chooses the order in which any such effects, including the effect of Collective Inferno's last ability, apply
It's as if Wizards is ashamed of the worthless promos and doesn't want to point them out to you when you receive them
Then there's the slightly more sympathetic take from infinitefancy, who shared their own rookie mistakes while offering some practical harm reduction advice: The cardboard-between-the-last-page-and-the-cover trick is actually something a surprising number of long-term collectors swear by
SDY-002 - Feral Imp
Master Duel players can earn Legacy Tickets by winning Ranked Duels as well as completing Solo Missions, and these tickets can be exchanged for Legacy Packs in the Bonus Pack tab of the Shop
Not only does this give you an opportunity to breeze through stuff that you might find a little too slow or mundane, but it also lets you further personalize your experience