Phantom Runesword

Equipped creature gets +2/+1, has first strike, and is a Warrior in addition to its other types.
Whenever you cast a Rune spell that targets Phantom Runesword, you may create a 2/2 colorless Spirit creature token named Einherjar with "Whenever Phantom Runesword becomes unattached from Einherjar, sacrifice Einherjar", then attach Phantom Runesword to it.
Equip {3}