Important to note, that you only need to say the card's principal name, not its subtitle
Or of course, use it to save a creature from removal or just re-up on a powerful enter the battlefield trigger
While I did have to deal with the back side of Lunarch Veteran // Luminous Phantom, I also got to hard-cast Harvester of Misery, which was great (but not for them)
P/T Number 201 Language English Legal Formats Alchemy, Brawl, Commander, Competitive Brawl, Historic, Legacy, Modern, Pioneer, Standard, Timeless, Vintage Rulings (6/6/2025) Each face of a nonmodal double-faced card has its own set of characteristics: name, types, subtypes, abilities, and so on
This can trigger up to three times each combat (once for each opponent) and it lets you dig through your deck to find the goodies
In practice, many small packages clear customs without being assessed, but do not count on it for high-value purchases