Zero, Assassin's Blade

Indestructible

Equipped creature is an artifact in addition to its
other type. It is unlockable and has "When this
creature attacks it gets +X/+X until end of turn
where X is your total devotion to its colors."

Reconfigure {w}{u}{b}{r}{g}: (Attach to target
creature you control; or unattach from a creature.
Reconfigure only as a sorcery. While attached this
isn't a creature.)