Avid collectors will search high and low for the best deals on Pokmon cards, packs, booster bundles, and limited-edition releases to secure a master set of whatever collection they're trying to complete
Black is one of the main engines in generating fast mana via Dark Ritual or Cabal Ritual, and black cards can cast spells from your graveyard all over again by using Yawgmoth's Will
We made the ETB effect a combination of card draw and card filtering, thus increasing your chances of drawing the cards you need to win the battle, and maybe even the card you'll later copy with the Overloaded Mage-Ring
On the other hand, for products like Secret Lair drops, Commander decks, or other preconstructed / box-set supplemental products, we used the cost of buying the sealed product (which is generally lower than the cost of buying all of the cards in the product individually) from around the time the set was released (for sealed product, you'll often pay much more if you wait until the set goes out of print to try to buy it)
For a full rundown of the contents in each booster type from Adventures in the Forgotten Realms , you'll want to check out the Adventures in the Forgotten Realms product overview
