They're not too expensive, and they're a very effective way to learn how to play
With first strike and land-based synergy, it lets you place +1/+1 counters on lands whenever your creatures enter, then later you can move those counters to a creature to gain life and draw cards
Once upon a time, Stock Up saw play in every format from Standard to Vintage
In any vampire deck, a turn 1 Blade of the Bloodchief spells doom for your opponents, and there are a couple infinites you can pull off with the Blade's counter production
what more can a Zombie deck ask for
I've been using various light sources to try to look through the top white portion of the back of the pack with no luck. The light trick he mentions is an time-honoured tradition of using light in a very specific way - along with a delicate tool - to search through the contents of a booster pack without ever breaking the plastic seal