The flash mechanic was introduced in Time Spiral and appeared for the first time in a core set in Tenth Edition
I believe that there is a high enough chance of decent cards, even if the packs were weighed, to offset the cost of the pack, or at least make the total cost of the pack at least a decent amount less
Target opponent discards a card
Speed Duel Starter Decks: Ultimate Predatorscontain 2 ready-to-duel Speed Duel Decks including 2 Ultra Rare variant cards specially chosen to boost each strategy
As a kicker, it also gains all the triggered abilities of the exiled cards including the ability to buff those stats based on the number of cards in your hand
Easily one of the least flashy and most widespread Skills in the game, but the extra LP is enough of a buffer to thwart 4000-damage OTKs and give you a chance to mount a comeback, and its lack of requirements means it's usable by any deck that doesn't need a dedicated Skill