Among the best black creatures MTG has produced for graveyard decks, Griselbrand remains the gold standard
Mox Sapphire + Mox Emerald + Mox Jet For the same reasons as the original dual lands, Mox Sapphire, Mox Emerald and Mox Jet wind up as the most expensive of the Moxes
These decks often include red, splash blue, deck wins, counter burn, UW weenie, UB fairies style agro control and various mono blue creature decks with things like Vedalken Shackles, Grand Architect and Opposition
If you don't meet one of those conditions when the ability tries to resolve, the ability is removed from the stack and does nothing
Some people dont like Temple of the false god, so you may want to remove it, but in general, its okay