So your Goblin Electromancer will reduce the cost of the spell youre splicing onto, not the splice cost, which is an added cost to change the text
Another choice could be Teleportation Circle, which can be used to temporarily exile a card before placing it back on the battlefield, effectively retriggering enter effects
Imagine you have a board full of tokens, plus a sac outlet like Ashnod's Altar
It usually refills your hand while sticking around to reduce the cost of your other legends
Youll still gain the 2 life as that isnt dependent on the card actually being exiled
It's this wonderful thing, we have it in our home in a frame, and it's kind of like saying good morning to her every morning when I walk my son down from waking up