Shady Ghoul is a low cost rare undead unit with high movement and a death effect. You can increase the strength of the spawned satyr by leveling up the card. Shady Ghoul sees play mostly in aggro or satyr zoo decks.
Shady Ghoul's power comes from its ability to push your front forward.
Shady Ghoul's high movement and low cost make it great for aggressive pushes. It also takes multiple cards to remove, from the enemy's perspective.
In addition to its high movement, the satyr spawned when it dies can also support your front.
However, Shady Ghoul does not have high strength, and is not a great defending unit. Because its ability can only spawn on bordering tiles, it is also possible for the enemy to block them off.