Soulbound Familiar

Bestow {3}{b}(If you cast this card for its bestow cost,
it's an Aura spell with enchant creature. It becomes a
creature again if it's not attached to a creature.)
Enchanted creature gets +1/+1.
When the creature Soulbound Familiar was
attached to dies, Soulbound Familiar gains all
activated abilities of that creature. (If any of the
abilities use that creature's name, use this
creature's name instead.)