Gisela, the Broken Blade Gisela, the Broken Blade can be considered a 4-mana Baneslayer Angel
The second time was an eBay sale I made (the Nether Shadow)
It's theoretically possible that, if you were to weigh literally thousands of packs to choose your heavy favorites, and bought hundreds of them, you might get a slightly higher pull rate of rare cards than if you bought the same number of random packs - but I don't recommend it, for two main reasons: Most game stores don't permit you to weigh individual booster packs before buying them - mostly because it takes a long time and holds up the line
As stated in the news story, this was used on Japanese Pokemon cards before Wizards was ever involved
This is also the fun part cracking packs is half the reason people collect
Charizard ex (Tera, Special Illustration Rare) Charizard always finds a way to top the charts, and its Tera-type version in Obsidian Flames is no exception