Crimson Bog of the North

{t}: Add {s}.
-When this land enters the battlefield, pair it
with a creature you control until one leaves play.
If it is unpaired, you may pair it with a creature
you control as it comes into play.
-Crimson Bog of the north gains "{t} Add {b}."
when paired
-A Creature paired with Crimson Bog of the
North gains DeathFeed 1, gains the Black
color, and the Vampire type.
"Behold, Vapirism's Unholy Source!"