Nighthowler is one of the newest "Theros" spoilers revealed today Sept. 3, 2013 from Wizards of the Coast's upcoming expert "Magic: The Gathering" expansion set in an article on DailyMTG.com. Nighthowler is a powerful rare black creature that can grow very large real fast. It's also the Game Day top eight rare.
Nighthowler - 1BB
Enchantment Creature - Horror (Rare)
Nighthowler and enchanted creature each get +X/+X, where X is the number of creature cards in all graveyards.
You'll need to dump creature cards into your graveyard quick in order for Nighthowler to grow. Lotleth Troll, Grisly Salvage, and Commune with Nature can all help you accomplish that. Because you'll need several creatures in your graveyard for Nighthowler to be an imposing threat, Shadowborn Apostle and Shadowborn Demon makes a great additions. Rescue from the Underworld could be a killer play might be if you've discarded a Shadowborn Demon to Lotleth Troll early on and then managed to cast another in the late game. Both will come back to destroy two of your opponent's creatures.
How will you use Nighthowler?
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