When we play in person, we can demonstrate a loop and specify how many times we want to repeat that loop. I love building durdly decks or decks that combo off and I can't really play them on Arena without timing out. As a seasoned software engineer, I think this would be feasible in the Arena game engine with little overhead. I envision a tracker that looks for loops and when it notices one occuring a number of times over some threshold, asks the user how many more times they would like to repeat the loop ( 0 or more ). I think this feature would bring a lot more diversity to arena and better align it's capabilities with paper magic.