The first time you get priority in the draw step, i.e., the first time your opponent passes priority to you in that step.Quote from schweinefett »When is the first time in an opponents turn where I can actually cast reset?
116.3. Which player has priority is determined by the following rules:
116.3a The active player receives priority at the beginning of most steps and phases, after any turn-based
actions (such as drawing a card during the draw step; see rule 703) have been dealt with
and abilities that trigger at the beginning of that phase or step have been put on the stack. No
player receives priority during the untap step. Players usually don’t get priority during the
cleanup step (see rule 514.3).
116.3d If a player has priority and chooses not to take any actions, that player passes. If any mana is
in that player’s mana pool, they announce what mana is there. Then the next player in turn order
receives priority.
504. Draw Step
504.1. First, the active player draws a card. This turn-based action doesn’t use the stack.
504.2. Second, the active player gets priority. (See rule 116, “Timing and Priority.”)
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'You may reveal this card from your hand as you draw it if it’s the first card you’ve drawn this turn.'
Its linked triggered ability is:
'When you reveal this card this way, you may cast it by paying [cost] rather than its mana cost.'
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Those responses will resolve before Miracle trigger; then you may cast the Miracle card.
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The correct sequence is to cast Bust and retain priority in order to activate (and sacrifice) Fetchland, THEN pass priority.
...as Kahedron (tried to) explain.
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When the situation arises, you'll physically pile those paper-notes, as if on a stack; resolutions will be that much easier to grok for everyone.