The Eldrazi Horde (Card List)

This is the cardlist for the Eldrazi Horde. In this format, at least 3 players attempt to defeat the Eldrazi Horde. Every turn, the Horde draws and casts a card. They may then attack a random player (dice roll is probably the easiest method to decide. Then their turn ends. If the Horde has 6 Eldrazi Scions/Spawns on the battlefield before the start of Combat, they sacrifice them and then draw and cast a card from the Sideboard. It does this until it does not have enough Scions/Spawns.
When a player deals any sort of damage to the Horde, the Horde mills that many cards. The players win if the Horde cannot draw a card at the start of its upkeep.

Additional Rules/Funstuffs

Emrakul, Ulamog, and Kozilek; when they die, they are returned to the sideboard (or you can choose to exile them to lower the difficulty).
Players can start the game with one of the 5 pacts. And to lower the difficulty, you can ignore the mana you need to pay next turn for them.
If you have more players or want it to be harder, you can have the Horde draw 2 cards per turn or reduce the amount of Scions/Spawns needed to 3.
You can choose to combine the sideboard and main deck (if a turn 1 Emrakul sounds fun???).
You can also choose a life total for the Horde to start at and work together to reduce it to 0.