How to play Horde magic: Horde Magic: A New Way to Play Magic and Survive Zombie Invasions

• Sliver Legion should be placed at the bottom of the deck at the start of the game.
• Metallic Slivers play as if they were tokens for the horde deck.
• Horde's creatures have regular summoning sickness (so haste slivers have a purpose)
• Horde's creatures do not use activated abilities or optional triggers unless the commander sliver is on the board (the brain of the sliver swarm)
• Horde reveals 2 cards at a time and the limit is raised by 1 every 2 turns after the commander sliver is first cast.

As an added bonus to the horde:

• Whenever the horde's library is empty, shuffle its graveyard into its library. (Slivers are meant to be endless and the only way to win is to "attack the graveyard" regularly to make sure they don't come back)
• STAR/STAR tokens have strength and toughness equal to the number of slivers on the battlefield (because some big threats should always be there)

Source: Horde Magic: An Open Source Project