I think LK covered most of it, I think
herald is too much of a shot in the dark to make a card based SOLELY on being able to
herald it, I'd make it more like a perk, like the cantrips in MtG, you gen a smaller effect AND get to draw a card, so sometimes it's worth to play with them if you don't need a bigger effect. And yeah, Foresee should be limited, the biggest Scry card I say WAS Foresee, and c'mon, it was a 4-mana sorcery that had Scry 4, and it was ALL it did side from drawing cards. I think Foresee in LotR should either come at a high cost or smaller amounts, like 4 TOPS in SPECIALIZED cards. In MtG, aside from dedicated decks, sure, you can stack the top 5 cards of your library with an Index, but let's face it, it means you'll be planning you next 4-5 turns. In LotR, looking at 4 cards gives you an ENTIRE new, almost-perfectly-carved hand due to the amount of card-drawing that takes place.