Sea of Corpses

5th Layer: Sea of Corpses is a Shared Land that
can only be used starting on a player's 6th turn.
{t}Add {5} of {w}, {u}, {b}, and {r} in any
combination to your mana pool.
Location
Strain of Ascent-The player takes 6 damage and
damage equal to the attack power of all their creatures combined, then their creatures get
-7/-7 until end of turn.