Sword of Spirit
Legend
I like the spell. Sometimes it will last longer, sometimes it will last shorter. But you don't have to decide to cast it until you want to cast it, so you aren't going to waste a spell slot by casting it on one turn and not having it come up at all. I think that is worth having a variable duration based on randomly rolled initiative and your choice of when to use it. It doesn't really need a boost; it's a great spell.