Even if you fail to use Essence Flux in this exact circumstance, one mana to save a creature from removal is a great cost that's sure to provide you with a mana advantage in most situations
The spells and Golgari Raiders though don't do anything until you have at least one creature card in your graveyard
It gives you a card right away, and its a 1/1 flier with deathtouch, which either eats a removal spell or kills a much bigger creature
Its such a pain to play against, too, as it does the things you dont want it to at the worst possible times
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They've been around for years, incredibly reputable and well-known in the community, and the safest choice to buy these expensive cards