March of the Hunted

Put a number of token's on your side of the battlefield that are copy's of each creature in each players graveyards, thees tokens are spirit in addition to there other creature types, that cannot attack or us there ability's.
When a creature enters the graveyard add a token to your side of the field that's a copy of that creature with this enchantments following affects. When a creature leaves the the graveyard remove the following token from the field.