While sitting a four-mana might be a bit tough and does restrict you from playing many artifacts of your own, being able to wipe the board will likely be worth running one or two of these in your deck
Mega Dragonite ex (MUR) 250/193 Est
As a result I dont think its prudent to play Leyline of the Void because it almost demands four slots
there's always a chance that another PSA 10 Black Lotus hits the market at some point, or some other big rare collectable comes along, but with the one 1/1 The One Ring, this will never happen
The tutor is restrictive but in just Blue you can fetch creature removal (Pongify / Curse of the Swine), card draw (Pull from Tomorrow), countermagic (Counterspell), and of course, the mighty Cyclonic Rift
Although this battle has six defense, the huge army of Knights you will have created as you play it should have no trouble tearing it down