Just like Gontis Aether Heart this makes it an auto-include within any Energy deck, perhaps even more so
As "Labrynth" monsters are all DARK, "Shadow-Imprisoning Mirror" is also very effective against Labrynth monsters and can counter them from searching Trap Cards
Now for the pricier cards, we'd say invest in a jeweler's loupe or magnifying glass so you can analyze the tiny details
All total, each Duel Devastator box includes 56 Ultra Rare cards (5 Ultra Rare variants, 1 new Ultra Rare, 20 Extra Deck monsters, and 30 cards for your Side Deck), plus 4 (of 12) Field Centers, and the heavy-duty storage box.
Once per turn, when a Spell/Trap(s) is Set on your field (except during the Damage Step): You can Special Summon 1 "Power Tool" Synchro Monster or 1 Level 7 or 8 Dragon Synchro Monster from your Extra Deck