If you change the target of a spell to one that has an increased cost to target (Elderwood Scion), do you have to pay the increased cost? If Grip of Chaos changes the target of a spell my opponent controls to my Elderwood Scion, does the controller of the spell have to pay the 2 or no since the spell has already been paid?
If you change the target of a spell to one that has an increased cost to target (Elderwood Scion), do you have to pay the increased cost? If Grip of Chaos changes the target of a spell my opponent controls to my Elderwood Scion, does the controller of the spell have to pay the 2 or no since the spell has already been paid?
The cost was actually "locked in" shortly before they paid the cost. The Elderwood Scion's effect is irrelevant after that.
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.
601.2g If the total cost includes a mana payment, the player then has a chance to activate mana abilities (see rule 605, “Mana Abilities”). Mana abilities must be activated before costs are paid.
601.2h The player pays the total cost in any order. Partial payments are not allowed. Unpayable costs can’t be paid.
Example: You cast Altar’s Reap, which costs {1}{B} and has an additional cost of sacrificing a creature. You sacrifice Thunderscape Familiar, whose effect makes your black spells cost {1} less to cast. Because a spell’s total cost is “locked in” before payments are actually made, you pay {B}, not {1}{B}, even though you’re sacrificing the Familiar.
601.2i Once the steps described in 601.2a–h are completed, effects that modify the characteristics of the spell as it’s cast are applied, then the spell becomes cast. Any abilities that trigger when a spell is cast or put onto the stack trigger at this time. If the spell’s controller had priority before casting it, they get priority.
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Why bother with mere rulings when so many answers can be found in the Rules?
The spell was already cast, so an effect about casting the spell doesn't come into relevance. There is no concern about what it takes "to cast" the spell.
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