I've been looking into the ability of AT Metagross from Ancient Origins/Bandit Ring. If you don't already know, this thing is a 150 HP monster, with Theta Double. The real attack to look at with Metagross is Machine Gun Stomp, a DCE for 20, so on its own, pretty bad. But the effect is what makes it work, the attack does 10 more damage for each card in your hand. If you play a sycamore, excluding tool cards, you're already doing 90 damage for a DCE. Also, since Seismitoad is going to disappear because of the impending rotation and the amount of grass decks showing up, you can use Rare Candy to get a Metagross going faster. So, what do you think? Could this be a viable deck?