Ghalta, Primal Hunger costs less for the power the battlefield. Assuming I understand the order of casting a spell, then it can be cast for XGG, where X is 12 - total power on the casters battlefield. While Ghalta is being cast, first X is determined to find the cost, then costs are paid.
Assuming all of this to be correct, then mana abilities that modify this total power would not modify the required cost to be paid, as the cost is paid at a subsequent step in the process of casting. The cards relevant to my question are: Omnath, Locus of Mana, food chain, phyrexian altar and ashnod's altar.
In the case of each of these, if there is 10 power on the battlefield as Ghalta is cast, then each of those creatures that sum to 10 power are sacrificed or exiled for mana abilities, is the total cost paid for the spell still GG?
Similarly, if there is 9x G floating on Omnath, does the change in power altered the required cost paid for Ghalta?
As far as I understand, Ghalta could be cast with only a 1 cost 10/10 being exiled to food chain to generate GG and no other mana paid or creatures on the battlefield. Is this correct?
if I understand your question correctly, you are correct.
all the costs for the spell are determined prior to actually paying for those costs (601.2f)
Then the resulting total cost becomes “locked in.” If effects would change the total cost after this time, they have no effect
THEN the player may activate mana abilities to actually pay for the cost (601.2g), at this point the costs are locked in
THEN the player actually pays those costs
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Assuming all of this to be correct, then mana abilities that modify this total power would not modify the required cost to be paid, as the cost is paid at a subsequent step in the process of casting. The cards relevant to my question are: Omnath, Locus of Mana, food chain, phyrexian altar and ashnod's altar.
In the case of each of these, if there is 10 power on the battlefield as Ghalta is cast, then each of those creatures that sum to 10 power are sacrificed or exiled for mana abilities, is the total cost paid for the spell still GG?
Similarly, if there is 9x G floating on Omnath, does the change in power altered the required cost paid for Ghalta?
As far as I understand, Ghalta could be cast with only a 1 cost 10/10 being exiled to food chain to generate GG and no other mana paid or creatures on the battlefield. Is this correct?
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all the costs for the spell are determined prior to actually paying for those costs (601.2f)
THEN the player may activate mana abilities to actually pay for the cost (601.2g), at this point the costs are locked in
THEN the player actually pays those costs