This was the first of the series I played and possibly the best entry point. There was only one version, and it brought in a ton of changes that basically completed the formula, perhaps most notably making health persist between battles. Deckbuilding and grid based tactical action worked really well together, and the way moving around served both to aim your attacks and avoid enemy ones was brilliant. Super fun game, really dug getting to each new area, beating bosses and getting new chips.