What are the rules for missed triggers in Riftbound, and do triggers like drawing cards from Jinx Legend follow missed trigger rules or missed draw rules?

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A triggered ability becomes eligible to go on the chain when its trigger condition is met; whether it actually becomes a chain item can depend on how the ability is templated (for example, whether a “you may” is part of the trigger sequence). If a controller declines an optional trigger (or an ability’s template makes the decision to put it on the chain optional), that ability is not considered to have triggered. Abilities whose text places a conditional (an “if”) in the effect portion (not the trigger portion) will still trigger at the appropriate time but may do nothing on resolution if the condition is false. The Loose Cannon, the Jinx Legend example in the FAQ is an instance of this latter case: the ability triggers at the start of the phase and is placed on the chain, then resolves and draws only if the hand-size condition is true [383] [383.1] [383.2.c] [FAQ:unleashed#1] [FAQ:unleashed#3].

“Missed triggers” occur when a trigger that could be placed on the chain is not placed there (for example, when an optional trigger is declined). Whether a trigger is optional or mandatory depends on the ability’s templating (a “you may” next to the conditional is the controller’s decision to put the trigger on the chain) [FAQ:unleashed#1]. For abilities like Loose Cannon, the Jinx Legend that read “At the start of your Beginning Phase, draw 1 if you have one or fewer cards in your hand,” the “if” is part of the effect (not the trigger), so the ability still triggers at the start of the phase and is placed on the chain; the draw is performed only if the condition is true when the triggered ability resolves [FAQ:unleashed#3] [383.4.a.2].

Identify whether the ability’s wording places the conditional in the trigger or in the effect. If the conditional is part of the trigger, it must be true at trigger time for the ability to become eligible to go on the chain [383.1] [383.2.c]. If the ability’s template includes a 'you may' next to the conditional that is part of the trigger sequence, the controller chooses whether to put the triggered ability on the chain—if they decline, it is considered not to have triggered [FAQ:unleashed#1] [383.3.f.1] [383.3.f.2]. If the conditional is part of the effect (the 'if' appears after where the template splits trigger vs effect), the ability still triggers at the appropriate moment and is placed on the chain; when it resolves, evaluate the 'if' and perform the draw only if the 'if' is true [FAQ:unleashed#3] [383.4.a.2]. If an ability is explicitly a Play Effect or Targeting Effect, follow the specific timing rules for when those triggered abilities are put on the chain (e.g., Play Effects are placed on the chain after the permanent is finalized) [383.4.a.2].

A triggered ability that is worded to trigger 'once each turn' still follows the same placement rules; the controller may choose the single time it triggers and may decline to put it on the chain at that time—if they decline, it did not trigger that turn [383.3.f.1] [383.3.f.2]. If an ability’s effect instructs a player to act on private information (e.g., choose a card from a hidden hand) and would compel a player to perform an action on a private card type, [FAQ:unleashed#7] applies: the player may ignore being compelled to perform that action (this can interact with whether a triggered effect can actually do anything on resolution). If you are unsure whether a particular worded clause is part of the trigger or part of the effect for a card not covered by the FAQ examples, the templating guidance from [FAQ:unleashed#1] and the timing rules in [383] are how to determine whether the ability must be placed on the chain or can resolve to a conditional result.

Triggered abilities become eligible to go on the chain when their trigger condition is met; the exact behavior depends on how the ability is templated and whether parts of the text are the trigger condition or part of the effect [383] [383.1] [383.2.c]. The Unleashed FAQ explains that triggered abilities can be parsed into a trigger condition, an optional conditional, a 'you may' that indicates the decision to place the ability on the chain, and a cost-within-instruction that becomes the base cost of the triggered ability [FAQ:unleashed#1]. That 'you may' near the conditional is the moment a player chooses whether to add the trigger to the chain; if they decline an optional trigger (or the rules state that they 'may choose' to place it on the chain), the ability is considered to have not triggered [383.3.f.1] [383.3.f.2]. The distinction matters for effects that look like 'At the start of your Beginning Phase, draw 1 if you have one or fewer cards in your hand.' The explicit example in the FAQ shows that this 'if' is part of the effect, not the trigger. Therefore, the ability triggers at the start of the phase and is put on the chain; when that triggered ability resolves, you then evaluate the 'if' and draw only if the condition is true at resolution [FAQ:unleashed#3] [383.4.a.2]. In short: a 'missed trigger' (in the sense of an optional trigger being declined or not placed on the chain) is handled by the controller’s decision to place it on the chain per the ability’s templating [FAQ:unleashed#1] [383.3.f.1]; abilities whose draw clause is an effect-conditional (the Loose Cannon, the Jinx Legend example) still trigger at the appropriate time but only actually draw on resolution if the condition is true [FAQ:unleashed#3]. If you have a specific card text you're asking about, provide it and I will parse whether the conditional is part of the trigger or the effect and apply the above rules.