They allow you to exchange ownership of permanents and profit from donating cards with positive or negative effects
Weighed card by card, holo and full art cards are heavier - so does that mean you should weigh booster packs before buying them, to have better odds of pulling valuable rares
Just how good it is is an unknown, since it isnt directly comparable to the existing resources of cards, life, and mana
The additional booster pack will help you better suite yourself to any adjustments needed to help recover precious lore
Vengeful Witch X DARK Level 4 [ Plant / Effect ] ATK 1100 DEF 1200 If you control "Black Rose Dragon", a monster that mentions it, or a Plant Synchro Monster: You can Special Summon this card from your hand
With its own regulation, you can play all the time