Here is an additional recommendation from me that has saved me a lot of work searching for all this Game content. I can only recommend you to save them in your Browser as favorites in the Bookmark Bar. If you search for the respective Game, stuff or other in the Steam Community Shop, it can happen that other content will be shown in the results which doesn't belong to it and this requires a lot of clicking through...

That's why I think these 2 links make the Search a bit easier and are a good help for Clarity.

Important:
These 2 pages are third party providers, you have the possibility to log in/register here with your Steam Account, but it is not necessary to use these sites, only when you want to trade or something else. Even though I have included these links here, in general, always be careful what you click on.



http://gtm.steamproxy.vip/market/listings/753/753-Sack%20of%20Gems
Here's the official Offer in the Steam Community Market.


https://www.steamcardexchange.net/
This page contains a Database of all known Games on Steam that offer the possibility to create/get Cards, Badges, as well as Emoticons, Backgrounds or Game-related content for the Points Store. There is also a trading Bot here, but I have no experience with it. If you click on an Item, you will be redirected to the official Steam Community Marketplace.


https://steamdb.info/badges/
In relation to the Steam Card Exchange, the Steam DB page has a complete overview of all known Games that are available on Steam or have been available in the past. This also includes the content for the Games, technical Infromations, DLCs, number of players and more.


Important Information:
The Prices and Availability are not always up to date with the Steam Community Market & Shop.


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........................Games: 69 __|__ Emoticons: 69 __|__ Backgrounds: 31

Here is the Overview of all Games I know that contain Pentagram Badges, if I missed any, please write me or in the comment section,, I will correct the list accordingly.

The Game name will take you directly to the Community Market with the relevant content.
I have also added the link to the Steam Card Exchange page for the respective Game.

Number of games: 69

Standard Badge Level 1 - 5
Foil Badge Level 1
* Some Games do not have Pentagram Foil Badge, but I have also listed them for a good Clarity.
* If the Game name has no linking, it means that the content is no longer tradable or available on the Steam Community Market.

Here is the overview of all Pentagram Emoticons known to me, if I have missed any, please write me or in the comment section, I will correct the list accordingly.

The Emoji name will take you directly to the Community Market.

Total number: 74

Here is the overview of all the Backgrounds I know, that contain Pentagrams. As always
if I have missed any, please write me or in the comment section, I will correct the list accordingly.

Total number: 31


BAPHOMET
.
.
Captain Sylar Octavian
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.
The Dark Ritual
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Acid Eyeballs
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Boss Montage
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Star Goddess
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The Lost Souls
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Pentagrams
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Graveyard
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RHSUE_tree
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DreadEye Concept Art
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Esher
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EVIL!
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Stranger
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NGU pages
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Scroll
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Hallway
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.
Double Pentagrams
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.
Fortune
.
.
Bat Attacks
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Bats Attack!
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.
Toot-toot, The Za Lord
.
.
A Dark Spell
.
.
Eliphas Levy
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At The Gates

Gazelle
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Zivko's Room
.
.
Star
.
.
Ilamentia Background 1
.
.
Pentagram
.
.
Item 1