With Hearth and Home, you get to end up ahead on board with a more relevant protection color in white (to stop pesky Path to Exile or a sneaky Swords to Plowshares)
This is much more interesting as a 4 shroud can be difficult for most non-seeker characters
The Seal of Orichalcos isn't really a promo, since it wasn't intended to make its way into the hands of players, and was never legal in any form of tournament play
They will also appear in every single Collector Booster pack
Unfair I think for any level of Commander that isnt cEDH, what kind of interaction you choose to play boils down to asking yourself, Is my opponent doing something fair? Graveyard decks are the perfect example to look at for this, as they are fundamentally breaking the rules. Whenever a game action is achieved through spending less mana than it usually should, its considered to be breaking the rules. Similarly, when a game action rewards you with more card advantage, mana production or other resources in greater abundance than the going rate, its also considered to be breaking the rules. Breaking parity in this way whether through a play as powerful as reanimating Griselbrand or something as innocuous as flickering a morph for less mana than the morph cost is what helps us win a game of Magic
One thing stands correct, though, Hand Traps are infinitely valuable