Haliya, Guided by Light is a strong Soul Sister effect that were excited to build
You don't have to pay any additional costs to do this, but you still have to observe the timing restriction when casting the plotted spell from exile
Marik Ishtar, the leader of the Rare Hunters, was able to acquire "The Winged Dragon of Ra" and "Slifer the Sky Dragon" using the power of the Millennium Rod, but Ishizu was able to protect "Obelisk the Tormentor" from him
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So if you cast Galvanic Blast with three artifacts but one is removed while its on the stack, Blast resolves, see that you control less than three artifacts, and only deals two damage
Whenever you cast a black spell, put a +1/+1 counter on Emet-Selch