Lady, of Sweet Nature

Soulbond (You may pair this creature with
another unpaired creature when either enters
the battlefield. They remain paired for as long
as you control both of them.)
As long as Lady is paired with another creature,
each of those creatures has "when this creature
dies, you gain 4 life"
If you control a Stark creature, Lady gains
"sacrifice this creature, target creature is
indestructible until end of turn"