3/21/2016 - The nice thing about delve that isn't true of affinity, is that it can feel free but it isn't. You do have to spend your alternate resource, so instead of accelerating unhindered as affinity does, you have to keep fueling your graveyard if you want to delve more.
Today I explore a hybrid of the two mechanics.
|ala Myr Enforcer|
Notably, delve for artifacts would also work quite nicely with dig.
It was actually quite challenging finding a way to pay homage to Arcbound Ravager that featured or supported the new mechanic (given that the original did neither for affinity, it rewarded it instead) while still resembling the original sufficiently. I expect there are still better solutions, but I can tell you this design is a lot closer than the preceding handful.