Neptune was considered the easiest FG before Lionheart and Serket were added. A simple Monoaether with Deflag splash on Fire mark beats him every day, as you can see in the FG Oracle threads.
There's no real reason to choose Trident. It's fairly useless when it comes to farming and generally weak. Advice geared towards building an early farming deck speeds up a newbie's gain of cards and electrum a lot more efficiently (Arsenic for rushes, Pulverizer for stall and controlbows, Lobotomizer for RoL/Hope and Monoaether and, to a lesser extent, Vamp Stiletto for rushes).