­Break Open is an instant so it's better xD

I think nothing about Break Open comes remotely close to cheating the costs on your own morph and/or resetting an unmorph trigger.

Not certain if SecretInfiltrator got trolled, or is making a valid point. 🤔

Neat trick, though. Fine in a custom cube, and I really like how this card can reset and retrigger a card like Icefeather Aven. But it's true that this is way too good for real magic. Oh, heck. You don't even have to turn a creature with morph face down. This just makes any creature a vanilla 2/2 for . That by itself would be a decent card... never mind flipping a card like Krosan Cloudscraper face up to go for a walk.

But again... just for this cube, presuming no insane morph creatures? Seems well above average, but doable.

Also, on a side note, it feels kind of dirty to turn morph creatures face up at sorcery speed. But maybe that's just me.

On power level:

Blue already has Reality Shift in real magic, and also gets the ability to transform creatures into 3/3's for one mana and at three makes things weaker than a bear. Blue also gets two mana blink effects that let you turn morphs face up (replacing the potential morph triggers with ETB triggers). And both of these types of cards are already costed as 1U Instants.

The card is a little pushed at two mana, but blue already gets comparable effects at instant speed for the same cost. I would cost the individual halves of this card as 1U Instants, and view changing the speed to sorcery as a reasonable payment for the modality/entwine, since you're losing the ability to use this card as a combat trick/instant speed removal, which is usually going to be far more valuable than the utility to unmorph your own stuff.