The Last Runeforged

Sacrifice an artifact: Regenerate The Last
Runeforged.
{w}{u}{b}{r}{g}: Another target elemental you
control becomes an aura with "Enchanted create
gains power and toughness equal to this card's
power and toughness.". Attach it to The Last
Runeforged. The Last Runeforged becomes the
colors of the enchanted elemental in addition.