Goblin Electromancers effect reduces that cost by , so when you actually pay the mana to cast Banefire, you only end up paying , even though X equals 5
The focus with Ib as Commander should be, in my opinion, to perform sacrifices while others create enchantments and creatures and a supply of cannon fodder, also in combination with further sacrifices, like Pashalik Mons or Goblin Warrens
Imagine swarming the board with a loyal air nomad army
Anyway, card flow is key to punching above your weight
This is because new cards are created all the time, creating a brand-new context for your cards every time that happens
Mishra and Urza are no different, as both require powerful artifacts to be in play alongside the brothers corresponding creature cards in order for them to meld into a singular, more powerful card altogether