I believe the actual reason behind them is the following
It costs six mana, has a horrible stat line for six mana, and needs to be recast when it blocks
Emerald cards often punish opponents by forcing them to discard cards, making them a great counter to aggro decks
Use it for CCGs, TCGs, living card games, expandable card games, prototype card games, or even educational flashcard projects
The Lord of the Rings: Tales of Middle-earth Variants Foil: Sauron, the Dark Lord (0675 - Scroll Showcase - Silver Foil) NM EX VG G Other Versions Customers who purchased The Lord of the Rings: Tales of Middle-earth Variants : Sauron, the Dark Lord (0675 - Scroll Showcase - Silver Foil) also bought
Control decks are a prime examplethey rely on counterspells and efficient removal spells like Swords to Plowshares or Beast Within to keep the board in check and protect their own game plan