So with the foil's change to the wording to remove "instead" on Prime Warden's power he can enter into a limitless loop maintaining the loop as long as he desires.
This makes the draw or play a card seperate from the shuffling act and allows for the limitless loop. The loop can be done with 2 uses of the power before the start, but much easier with 3 or more uses before the start of your next turn. When you play "Conservation of Energy" or "Construct Cataclysm" you either must destroy or can destroy up to all of your constructs in play. As the destruction of a construct interupts the chain of destroying constructs to allow you to draw or play a card you can draw and play a card which if your deck is nothing but constructs can continue without limit.
At 3 instances of power uses you can draw 2 cards and play one card giving a net increase of 1 card in your hand and as long as the card played is a construct you may continue this chain until your deck is either in play or in your hand.
Captain Comsic's deck consists of 23 constructs and 17 other cards and the fact that the power shuffles the destroyed cards into the deck means constructs are either in play waiting to be destroyed, in hand waiting to be played or in the deck waiting to be drawn. The deck is already weighted for a construct to be more likely drawn then not leaves this very easy to sustain while you build your deck into your hand. This ultimately means you can continue drawing and playing cards until the player breaks the chain by refusing to play more constructs. At the least that "Construct Cataclysm" can do nigh infinite damage increase without limit.
An even more damaging combo that is easily achievable as you now have limitless plays is to cycle destroying and playing two "Autonomous Blades" with "Potent Disruption" Dealing 5 damage plus 2 damage from the blade. Replaying the blade resets the first time qualifier.
Essentaily once the chain is started Captain Comsic wins the game.
The conditions to achieve this loop are not difficult and can be done with any hero team with Prime Warden Captain Cosmic, in any environment as Captain Cosmic can allow out of turn hero powers with his Dynamic Siphon. Obviously this is easier with heros that allow other power uses like Argent Adapt, Prime Warden Fanatic, and America's Greatest Legacy.
Tests of this loop are defeating the Weekly oneshot in the vidoe game with the prime wardens in the second round. A game against Voss where he was defeated during the first environment turn.
As it stands the current ruling on this power is broken and needs to be fixed. The problem comes from the combination of being able to destroy multiple constructs with one play and being able to draw or play more then once per destruction. The easiest way is to have the draw or play conditional on shuffling so you can only draw or play once per construct destroyed. It's still a very strong and versatile power with this limitations, but not broken.
Attached is a picture during the second round where CC has no deck or discard and just playing cards till he defeats his brother.