Artifact — Equipment
Equipped creature gets +1/+1.
When equipped creature transforms, transform this Equipment.
Equip

Artifact — Equipment
Equipped creature gets +3/+3 and has first strike.
Equip

When Neglected Heirloom transforms, it remains attached to the creature it's attached to. If the equipped creature transforms into a noncreature permanent, Neglected Heirloom will become unattached before it transforms into Ashmouth Blade.