Can a card with Repeat (like Bellows Breath) be countered by Defy when the owner intends to repeat it, and does Defy stop the repeat effect?

Question

Accepted Answer

Yes. Defy can counter a spell that has Repeat (such as Bellows Breath) as long as the spell's total cost (including any Repeat additional cost the caster chose to pay while playing it) meets Defy's cost restrictions. If Defy successfully counters the spell, the spell does nothing and is cleared from the chain, so none of its effects (including any repeated executions) occur. Costs paid to play the spell are not refunded and still count as spent for other checks/triggers.

You may play Defy to counter a spell with Repeat, and whether Defy is legal to target that spell is determined using the spell's total cost that was declared/paid while the spell was being played (including any Repeat costs) [820.1.c.1] [357.1]. If Defy resolves and counters that spell, the spell does nothing and is cleared from the chain (so the base effect and any Repeat executions do not happen) [425.1.a] [820.3.a]. Costs paid to play the spell (including Repeat costs) are not refunded and still count as spent for purposes of other game effects that check energy spent while the spell was played [425.1.c] [FAQ:unleashed#21].

Opponent declares they are playing Bellows Breath and makes relevant choices, including whether to pay its Repeat additional cost [820.1.c.1]. The caster pays the combined energy and power costs, including the Repeat additional cost if they chose it; those costs are part of the spell's total cost [357.1]. You may play Defy (Reaction) in response; whether Defy is legal to target that spell is determined using the spell's total cost as declared/paid (including Repeat) [820.1.c.1] [357.1]. If Defy resolves and successfully counters the spell, the spell does nothing and is cleared from the chain, so neither its base instruction nor any extra executions from Repeat occur [425.1.a] [820.3.a]. Any costs (energy, power, or other additional costs) that were paid to play the spell are not refunded, and the energy spent still counts for any effects that check energy spent while the spell was played (e.g., certain legend triggers) [425.1.c] [FAQ:unleashed#21].

If you play Defy before the spell's controller has declared/payed Repeat (i.e., before the Make Relevant Choices step is complete), then Defy will be checking the spell's current declared cost at that time. Because the core rules excerpt here do not include the full timing windows for Reactions versus the Make Relevant Choices step, this timing can lead to ambiguous outcomes; the safe interpretation is that eligibility is judged using the spell's declared/paid cost at the moment you attempt to Counter it [820.1.c.1] [357.1]. Because Repeat is an additional cost paid while playing the spell and the spell is still only a single play regardless of how many repeats were paid [820.3.a], countering the spell does not 'partially' stop only some of its executions—if countered, the entire spell (including all repeats) is negated [425.1.a] [820.3.a]. Although a counter prevents the spell's effects from occurring, the energy spent to pay the spell (and any Repeat costs) remains spent and can still be observed by other effects that check energy spent when a spell was played [425.1.c] [FAQ:unleashed#21].

Repeat is an optional additional cost that is paid during the steps of playing a spell, and when you pay that additional cost the spell’s effect will be performed an additional time on resolution [820.1.c.1] [820.1.d.1]. The additional cost paid for Repeat is part of the spell's total cost and is paid along with the spell's other costs [357.1]. Defy’s text says it "Counter[s] a spell that costs no more than ..." — that cost check is applied to the spell as it was declared/paid while being played, which includes any Repeat additional cost the caster chose to pay [820.1.c.1] [357.1]. Countering a spell causes it to do nothing and be cleared from the chain [425.1.a]. Because a spell with Repeat is still only one play regardless of how many repeats were paid [820.3.a], a successful counter of that spell prevents both the base execution and any additional executions that would have been produced by paying Repeat—there is no way to counter only one of the repeat executions. Costs paid to play the spell (including Repeat costs) are not refunded by countering [425.1.c]. Additionally, those spent resources still count for effects that look at energy spent when a spell was played—per the official clarification, even if a spell is later countered, the energy that was spent when it was played remains considered spent for checks like Jhin - Virtuoso’s "when you play a spell, if you spent [4] or more" wording [FAQ:unleashed#21]. In short: you can Defy a repeated spell as long as its paid total cost fits Defy’s restrictions; if you do, the entire spell (including repeats) is countered and none of its effects happen, but paid costs remain spent.