It is greater than 224, actually.
SWS. Exchange for opponent's character. RA with 10/10 hero. Opponent blocks with SWS (doesn't exchange) it dies. Recur it (several ways that can be done infinitely I assume). In a MP game, it should be possible to get 1K ECs in your territory (assuming Redemption has enough uniques/generics, which I'm not sure of).