Goblin Electromancer
Creature — Goblin Wizard
Instant and sorcery spells you cast cost 
less to cast.
"Result 752: Rapid mass redistribution. "Result 753: Calamitous reverse synthesis. "Result 754: Acute disarrayment." —Izzet research notes
2/2
イラスト：
Guilds of Ravnica#174コモン英語適正
裁定
2017年3月14日
Two Goblin Electromancers will make instant and sorcery spells you cast cost 
less to cast, and so on.
2018年10月5日
To determine the total cost of a spell, start with the mana cost or alternative cost you're paying, add any cost increases, then apply any cost reductions. The mana value of the spell remains unchanged, no matter what the total cost to cast it was.
2018年10月5日
Goblin Electromancer's effect reduces only generic mana in the spell's total cost.