Shadowcaster is a 5 Mana Cost Epic Rogue Minion card from the Whispers of the Old Gods set!
Battlecry: Choose a friendly minion. Add a 1/1 copy to your hand that costs (1).
Flavor TextI mean, it's not creepy if you ASK before you steal their shadow to make a small replica of them to keep on your shelf.
These are the most recent decks that have featured Shadowcaster in the last year.