Does Locket of Yesterdays reduces colorless costs from spells you cast from your graveyard with flahback if there are multiple copies of the given spell in your graveyard (let’s say I have 3 copies of Think Twice in my graveyard. Would it cost only U to flashback or the cost would remain the same?)
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In your example, Think Twice's total cost will be U (2U [flashback cost] minus 2 [because two cards named Think Twice are in your graveyard] = U) (C.R. 601.2f, 702.33).
Since you move a card "from where it is to the stack" as the first step of casting it (C.R. 601.2a) and you determine costs at a later step of the process (C.R. 601.2f), Locket of Yesterdays won't count any spell you cast from your graveyard (such as Think Twice in your example) as a card in your graveyard. See also this thread.
EDIT: Correction and clarification after comment 4 was posted.
It's 3 copies of Think Twice in the yard, one of which leaves when it is cast. That leaves 2 copies to be counted by the Locket to reduce the spell's cost from 2U (alternative cost) to a total cost of just U, yes.
So it works as I understood it. Also, just to correct your answer, the flashbacked Think Twice would effectively costs U since the flashback cost is 2U and there will still be 2 copies of Think Twice left in my graveyard after I put the third one on the stack.
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Rollback Post to RevisionRollBack
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Since you move a card "from where it is to the stack" as the first step of casting it (C.R. 601.2a) and you determine costs at a later step of the process (C.R. 601.2f), Locket of Yesterdays won't count any spell you cast from your graveyard (such as Think Twice in your example) as a card in your graveyard. See also this thread.
EDIT: Correction and clarification after comment 4 was posted.
(peter somehow got the flashback cost wrong)
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