if you enchant a Sunforger with Power Artifact, does the equip cost become 0 or 1? Can I choose to apply the Power Artifact reduction first, so that nahiri reduces the cost to 0?
You can have the equip cost reduced to either 1 or 0, because you can apply the cost reduction effects in any order. This is from rule 601.2f (which applies to spells, but the rules tell us that it is mirrored for activated abilities).
602.2b. The remainder of the process for activating an ability is identical to the process for casting a spell listed in rules 601.2b-i. Those rules apply to activating an ability just as they apply to casting a spell. An activated ability's analog to a spell's mana cost (as referenced in rule 601.2f) is its activation cost.
601.2f. The player determines the total cost of the spell. Usually this is just the mana cost. Some spells have additional or alternative costs. Some effects may increase or reduce the cost to pay, or may provide other alternative costs. Costs may include paying mana, tapping permanents, sacrificing permanents, discarding cards, and so on. The total cost is the mana cost or alternative cost (as determined in rule 601.2b), plus all additional costs and cost increases, and minus all cost reductions. If multiple cost reductions apply, the player may apply them in any order. If the mana component of the total cost is reduced to nothing by cost reduction effects, it is considered to be {0}. It can't be reduced to less than {0}. Once the total cost is determined, any effects that directly affect the total cost are applied. Then the resulting total cost becomes "locked in." If effects would change the total cost after this time, they have no effect.
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You get to choose wether the equip will cost 1 or 0.
602.2. To activate an ability is to put it onto the stack and pay its costs, so that it will eventually resolve and have its effect.[...]
[...]
602.2b The remainder of the process for activating an ability is identical to the process for casting a spell listed in rules 601.2b–i. Those rules apply to activating an ability just as they apply to casting a spell. An activated ability’s analog to a spell’s mana cost (as referenced in rule 601.2f) is its activation cost.
601.2f The player determines the total cost of the spell. Usually this is just the mana cost. Some spells have additional or alternative costs. Some effects may increase or reduce the cost to pay, or may provide other alternative costs. Costs may include paying mana, tapping permanents, sacrificing permanents, discarding cards, and so on. The total cost is the mana cost or alternative cost (as determined in rule 601.2b), plus all additional costs and cost increases, and minus all cost reductions. If multiple cost reductions apply, the player may apply them in any order. If the mana component of the total cost is reduced to nothing by cost reduction effects, it is considered to be {0}. It can’t be reduced to less than {0}. Once the total cost is determined, any effects that directly affect the total cost are applied. Then the resulting total cost becomes “locked in.” If effects would change the total cost after this time, they have no effect.
if you enchant a Sunforger with Power Artifact, does the equip cost become 0 or 1? Can I choose to apply the Power Artifact reduction first, so that nahiri reduces the cost to 0?
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