Parasitic mechanics like this never do well on the secondary market unless they end up in a top competitive deck
Not all splashes are created equal though
While there are some of Azurite Sea's best cards in the Emerald/Sapphire decks, it's the way that every card, including the more cannon fodder characters, come together that makes it such a useful and powerful deck
You gotta acknowledge and be prepared for that if you're going to do it...no getting upset if someone reacts to you blowing a few land by knocking you for 20 (even if it may be an overreaction)
When Spellseeker enters the battlefield, you may search your library for an instant or sorcery card with converted mana cost 2 or less, reveal it, put it into your hand, then shuffle your library
Thats pretty awesome, but dont worry if you dont manage to get there