According to me, it's an over-powerful Remodel, like Counterfeit was an over-powerful Moneylender (or maybe Moneylender and Remodel were over-weak Counterfeit and Butcher ?) ! Because :
->it does all Remodel do, right ? (right now you trash a card costing $X and gain a card costing up to $X+$2), and it's not even mandatory !
->of course, it's by far more flexible,
->further more, if you don't want to trash anything, you can just use it as only a CT-gainer ! Maybe not that great, but if you don't want to trash anything you don't want Remodel too !
I'm sometimes frustated cards at $4 have respective equivalents so much stronger at $5 (Moneylender -> Counterfeit, Smithy -> Torturer/Catacombs, Young Witch/Sea Hag -> Witch... and Scout ) but on the other side, it's needful this way to make $5/$2 openings as strong as $4/$3 openings. Still, I think the gap between some $4 and some $5 is wide.