If One with the Multiverse leaves the battlefield and later returns to the battlefield (or you play a second one), it's considered a new object and you may cast a spell using its last ability regardless of whether or not you did so earlier this turn using the enchantment that was on the battlefield before
That's some solid versatility for such an unusual effect in this color pair, and even though it only has one printing, you can get it for about a quarter
If the enchanted creature leaves the battlefield in response to the triggered ability but the Aura is still on the battlefield, the Aura will be put into its owner's graveyard as a state-based action
Orim's Chant (Ext, S) One of the essential elements of a combo deck is a way to get the combo through against countermagic
A bit further down the list, past a couple more Melee
Compatible with top loaders, binders, deck boxes, and storage systems