Missing cards
Okay the past 5 booster packs I have earned through the challenges or bought have had really rare and awesome cards but when I went to my collection to look at them closer they weren't there this is getting very aggravating to have super awesome cards flashed in the opening sequence of a booster but then to be let down that those cards weren't there it makes me wonder how many other times this has happened and how this could be happening if someone has hacked or malwared my account or if it really just is a bug either way it's super frustrating from now on I will take screenshots of my packs and will post for the future hoping this can be rectified.
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[Deleted User] commented
Those probably are "Legends of the Multiverse" cards. You can find them under that header in the set list way way down at the bottom. Most are not Standard legal, so won't show up in a Standard search or for Standard deck building.