In case everyone missed it, there are some real vintage cards - Black Lotus, Moxen, Ancestral Recall, Sol Ring - in the current free Arena event (an "Ashiok versus Elspeth" pre-constructed deck event to promote Theros: Beyond Death). It was quite startling to open a starting hand with Ancestral, Black Lotus, and Underground Sea in the Arena client.
I would not be surprised if they bring a Vintage Cube to Arena at some point in the next year or so, though obviously the reliance on bots would be a weakness.
@serracollector You raise a good point about Sower. I had been running Sower and switched to Control Magic when Dreadhorde was super popular and there were a zillion Swords to Plowshares and Lightning Bolts.
I am not sure that card is even good to bring in against Dreadhorde now. I mostly want Control Magic/Sower to handle Hollow One so I think the switch to Sower makes sense.
I was considering dropping Control Magic all together.
I really like this Hollow Vine deck, it's basically Dredge minus Dredge. I think some of the Dredge tech might be worth considering here, such as Cabal Therapy, Vengeful Pharaoh, and even Hogaak.