Lords of Decay

At the start of each turn both players exile one of their own cards from the battlefield. If a Necrotic creature is exiled deal 2 damage. If Lords of Decay is exiled because of this effect deal an additional 5 damage.
{t}{x} Deal {x} damage or remove {x} Loyalty from an enemy Planeswalker
The Lords of Decay are the brains behind the Entropic movement.