Brainless Horde

Hellbent - You may cast Brainless Horde from your graveyard if you have no cards in hand. Whenever a goblin creature you control dies it costs {1} less to cast until end of turn.
When Brainless Horde enters the battlefield return each Goblin card from you graveyard to the battlefield then combine all Goblins you control into one creature (It has their combined powers and toughnesses, names, textboxes, mana costs, types and subtypes.)