This can be a significant upside if you happen to get a removal spell or board wipe that you'd rather not use at that moment
Depending on where you plan to sell bulk Pokmon cards, you might need to adhere to specific rules, such as each pile having X amount of cards or each pile must have X amount of commons, uncommons, and rares
Battlemage's Bracers are better than Illusionist's Bracers in some builds as they give haste and equip for one fewer in exchange for taking a mana to use when you copy each iteration, but that's worth it given the two bonuses
Nexus of Fate's last ability applies if it would be put into a graveyard in any way, including while it's resolving
The mechanic really didn't take off, and while Wizards of the Coast have since printed many powerful transforming cards, Kamigawa block's flip cards were relatively unexciting
As Holt puts it, nothing comes for free for other players. In a way, this also helps capture the horrific setting of Duskmourn, and tie Endless Punishment back to the overarching theme of the corresponding Magic set