So, I currently have a game going that started against a friend and turned into single-player after I found a way to have an infinite turn with my deck. I'm currently at 27 constructs, with what I would estimate to be over 1100 total points. The only bug that I noticed is that I'm not always allowed to guess properly when I play Great Omen Raven since some of my cards are not allowed as guesses. Some disallowed choices are cards acquired that turn, but others aren't...
Key requirements:
A deck that can produce 5 runes per turn, guaranteed (preferably one that can get completely into play)
A way to get all constructs to count as Mechana constructs: Hedron Link Device or Dimension diver
Tablet of Time's dawn in your deck or in the void
Reclaimax, to grab a Mechana construct from the void
(optional, but really helpful) Rocket Courier to put your Mechana constructs directly into play
(optional) Black Hole to help you throw away any mistaken pickup you make that might make your deck stop repeating or help make your deck start repeating
Directions:
Put Tablet of Time's dawn into play/throw it into the void
Kill monsters
Pick up cards that draw other cards
Play deck while grabbing Tablet of Time's dawn with Reclaimax since it will count as a Mechana construct if you're playing your cards right.
Get Reclaimax back into play
Repeat until you've killed Xeron enough to steal every card from your opponent's hand guaranteeing that they can't get in on the action once you end your turn