Because the engine on this is self-attrition, you need to see a copy of EX7 Yuuki early to maintain any presence on the board. With the correct trashing from your hand, HeavyMetaldramon can end of turn play out Heavymetaldramon ACE from your hand and set up a big wall for your opponent. The bad news is that usually means you have no hand left to play the game. Win quickly or not at all.