Perhaps, but Abom was nearly impossible to play before High Places: the best initiative character that could use it is 3/7 (and becomes 7/9 against NT heroes), and it could easily be negated without the aid of Asherah Pole or something of that sort. You basically had to start a side battle to play it. I wasn't really actively playing for the year between RoA and TxP, so I don't know how good of a strategy Abom was, but I know that High Places made it much, much easier. Now Abom is a formidable strategy that has made myself and others actually include I Am Grace in decks. Any other place card is nice with HP, but they could also be played more easily in normal battle situations than Abom, and none of them is the centerpiece of an entire deck strategy (Weakness might be the closest).