What are the rulings for Stormscape Familiar card?
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0. Can never affect the colored part of the cost.
1. If a spell is both white and black, you pay {1} less, not {2} less.
2. If this card is sacrificed to pay part of a spell’s cost, the cost reduction still applies.
3. The effect is cumulative.
4. The generic X cost is still considered generic even if there is a requirement that a specific color be used for it. For example, “only black mana can be spent this way”. This distinction is important for effects which reduce the generic portion of a spell’s cost.
5. The lower cost is not optional like with some other cost reducers.
6. This can lower the cost to zero, but not below zero.
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