Dies is Magic shorthand for goes from the battlefield to the graveyard, which is what happens to creatures and creature tokens when they trade in combat, are destroyed, or are sacrificed
Spell cards can help fortify monsters and deplete your opponent's resources, but some can also be used defensively
Imakuni wants you to play him as a Basic Pokmon, but you can't
The length of the sleeves is perfect for Japanese Packs and works great for preserving and protecting them.The only issue I have with them is that the sleeves are a bit tight, so for the ADV/Ruby & Sapphire era packs it can be hard to fit them since they have 11 cards per pack
Each box guarantees at least one SR-tier pull (from the 16-card SR pool, which includes the four SAs)
For more information, see Best Practices for Pricing Your Items