Brigby, it's not necessarily a loop prevention you need. Just stop older set interacting with newer sets in most cases and it will eliminate pieces interacting as they won't be in the decks together.Having Origins around for her I get...kinda, but having BFZ & SOI card interacting with IXA & DOM for example is a recipe for disaster. It why the paper version rotates out older sets.There is one spell combo about with new cards and a few masterpieces that has been going around. Mostly Ram Derek planeswalker.
I think this is certainly an interesting discussion, and I'll pass it along to the team for review.