Theres really so much choice here and so much of a difference in cost, you can tailor this CMC to the amount of money you want to spend on the deck
Theres a lot of ways to break these, like running creatures that create multiple bodies, but having to include these in certain build-arounds holds them back a bit
In order to help you along with your spell thievery, you get cards like Dream-Thiefs Bandana, which is a very cool new equipment that effectively gives you an extra trigger of Gontis ability, Cunning Rhetoric, which punishes your opponents for attacking you, and Heartless Conscription, which is a mass removal spell and exiling fuel for your gameplan
In Amber that theme is healing, of course
What Is a Fracture Foil
It guarantees a land in hand each turn, but I'd challenge that it's ramp at all