When is the last opportunity to recycle a rune during combat to trigger Sivir, Battle Mistress's ability to create a gold token, and can you recycle runes without paying for anything?

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Accepted Answer

You may only Recycle when a game effect or a cost instructs you to do so; you cannot arbitrarily Recycle runes 'for free.' The last opportunity to Recycle a rune during combat to trigger Sivir, Battle Mistress is the last moment in combat when a game effect or cost instructs or allows you to Recycle (or when you are paying a cost that includes Recycle). If Sivir, Battle Mistress's trigger includes a "you may" or a cost-within-instruction, the decision and any cost payment happen during finalization as described in the triggered-ability sequence.

You cannot Recycle runes at will; Recycle is a Limited Action that must be performed when a game effect or a cost directs you to do so [416.2] [416.2.a]. Therefore, the last opportunity to Recycle a rune during combat to cause Sivir, Battle Mistress to create her gold token is the last time during that combat that an effect or cost instructs you to Recycle (or the point at which you are paying a cost that includes Recycle). If the ability that would create the token is a triggered ability with a "you may" and a cost-within-instruction, the decision to put it on the chain and to pay its cost is made during finalization, per the triggered-ability sequencing guidance [FAQ:unleashed#2] [FAQ:unleashed#1].

Confirm the exact text of Sivir, Battle Mistress's ability (assumed here to trigger from a Recycle during combat). Look for any game effect, spell, or ability that instructs you to Recycle a rune during combat (costs that include Recycle also qualify) — Recycle is only legal when an effect or cost tells you to do it [416.2.a]. If Recycle is part of a cost, pay it during the Pay Costs step; the cost must be possible to pay to play/activate the item [357.1] [416.3]. If Recycle is part of an effect, when that effect resolves you must Recycle as many cards as possible from the specified zone(s) [416.4]. If Sivir, Battle Mistress's ability triggers from that Recycle, the trigger will be placed on the chain when the trigger condition and any extra conditional are fulfilled and you choose to put it on the chain; any cost-within-instruction is paid during finalization [FAQ:unleashed#2] [FAQ:unleashed#1].

If a cost instructs you to Recycle but you cannot complete the Recycle (e.g., no runes to Recycle), you cannot pay that cost and therefore cannot activate the ability that requires it [416.3]. If an effect says 'Recycle X' but fewer than X cards are available, you Recycle as many as you can when resolving the effect [416.4]. If multiple cards are Recycled to the Main Deck simultaneously, the order is random; to the Rune Deck, the owner chooses the order — this can matter if other abilities look at or depend on the order of recycled cards [416.5] [416.5.a]. If Sivir, Battle Mistress's ability itself contains a "you may" next to the condition and a cost-within-instruction, the choice to put it on the chain and the payment of that cost happen during finalization, not at trigger detection [FAQ:unleashed#2]. Recycling as part of resolution or as a cost is a Limited Action and cannot be done outside of the moments the game allows Limited Actions to be taken [416.2] [429.4].

Short answer: You can't just Recycle runes 'for free.' Recycle is a Limited Action and must be performed when a game effect or a cost instructs you to do so [416.2] [416.2.a]. Therefore, the last opportunity to Recycle a rune during combat to cause Sivir, Battle Mistress to create a gold token is the last moment in that combat when an effect or a cost tells you to Recycle (or when you're paying a cost that includes Recycle). If you attempt to activate something that lists Recycle as a cost, you must be able to actually perform that Recycle to pay the cost [416.3]; if you can't, you can't activate the thing. If Recycle is part of an effect rather than a cost, when the effect resolves you must Recycle as many of the specified cards as possible [416.4].

Timing and triggered abilities: If Sivir, Battle Mistress's ability is a triggered ability tied to a Recycle action, the process for putting triggered abilities on the chain follows the split-sequence guidance. If the ability includes a "you may" and a cost-within-instruction, the decision to place it on the chain and the payment of that cost occur during finalization; the ability's effect (e.g., "create a gold token") becomes the finalized chain item once those steps are completed [FAQ:unleashed#2] [FAQ:unleashed#1].

Practical implications: Look for any effect during combat that tells you to Recycle (for example, an ability that says "Recycle a rune: ..." or an effect resolving that instructs you to Recycle runes). That is when you can perform the Recycle and thereby cause Sivir, Battle Mistress's trigger (if her ability watches for Recycle). If no effect or cost is allowing or requesting Recycle, you have no opportunity to Recycle runes just to generate the trigger.

If you want a ruling tied to a precise wording of Sivir, Battle Mistress (for example whether her trigger looks for Recycle as a cost vs. Recycle as part of an effect, or whether it only triggers "during combat"), please provide her exact card text and I will apply the above rules to that exact wording.