This cube is meant to evoke feelings of playing vintage in 2003 at a small game store in Ohio. It uses only cards printed before Eighth Edition, except all the fetches and shocks are included.
I recommend playing it with the following rule variations, copied from the "Middle School Rules" page on Eternal Central :
Sixth Edition Style:
C.1 Ruling.3 — The combat phase can be mapped in a longer form like this:
As a reminder, Howling Mine and Winter Orb turn off when tapped, but only because that's how they're templated; it's not a rules difference.