If Azir, Ascendant attacks and then uses its ability to swap with Azir, Sovereign from another battlefield, does Azir, Sovereign trigger its 'When I attack' ability and bring sand soldiers?

Question

Accepted Answer

No — moving/swapping a legend into the attacking spot does not make that legend have attacked or be played, so its “When I attack” trigger will not trigger. Only the unit that actually attacked produces its attack triggers. If the swap effect explicitly states it “plays” the legend or causes it to attack, that changes things (see assumptions).

Under normal swap/move effects, Azir, Sovereign will not trigger a “When I attack” ability when it is swapped into the attacking Azir’s position after Azir, Ascendant attacked. Attack triggers trigger from the unit that attacked; play effects (and Weaponmaster’s play timing) trigger only when a card is played, not when it is moved/Swapped. See rules [821.1.c] and [184.3].

Start: Azir, Ascendant is the unit that declared and performed the attack; any “When I attack” triggers belonging to that specific unit are placed on the chain as appropriate. If the swap ability is used after the attack (or as a post-attack effect) to exchange Azir, Ascendant with Azir, Sovereign, that action moves the cards between battlefields but does not ‘play’ Azir, Sovereign and does not retroactively make Azir, Sovereign the unit that attacked. Because most “When I attack” triggers reference the unit doing the attack, only the unit that actually attacked created that attack trigger. Moving a different copy into that battlefield does not create a new attack event for the incoming unit, so Azir, Sovereign has no attack trigger to place on the chain at that moment. Weaponmaster and other Play Effects only trigger when a unit is played (see the Weaponmaster functional text). Moving/Swapping does not equal playing, so play-triggered effects won’t trigger on a simple swap.

If the swap effect’s text explicitly “plays” Azir, Sovereign (or otherwise uses language that causes it to be treated as played), then play triggers (including any Weaponmaster play effects) could trigger. The ruling above assumes the swap does not use the word “play.” If the swap effect explicitly instructs that the incoming legend is considered to have attacked (or retroactively assigns the attack), then its attack triggers could trigger — but this must be spelled out by that effect. If there is a replacement effect or continuous effect that changes what constitutes “attack” or what “played” means for these legends, that could alter whether triggers fire. Those effects are outside the provided context. If the attack trigger on Azir, Sovereign is worded to trigger when ANY friendly unit attacks (rather than “When I attack”), then it would trigger when Azir, Ascendant attacked. The ruling assumes the trigger is “When I attack.”

The key point is that triggered abilities that read “When I attack” trigger only when that specific unit performs an attack action; swapping or moving a different unit into that battlefield after the attack does not make that unit the attacker retroactively. The Weaponmaster keyword is explicitly a Play Effect that functions as “When you play me …” and so only applies on play actions, not on movement or swaps [821.1.c]. A Sand Soldier token is defined as a 2 Might Shurima unit token [184.3]. The provided Core Rules text for Weaponmaster emphasizes its connection to the action of playing a unit, not moving it [821.1.b]. Rule guidance about triggered abilities referencing contextual information also supports that triggers reference the unit and its state at the time the trigger is created and executed [359.3.f.4]. Therefore, under the assumption that the swap simply moves/exchanges the two legends and does not itself “play” the incoming legend or declare it to have attacked, Azir, Sovereign will not trigger a “When I attack” ability when swapped into the attacking Azir’s spot after Azir, Ascendant attacked. If the swap effect’s text instead specifies that the incoming Azir is being played or is considered to have attacked, that would change the outcome (play triggers or attack triggers could then occur).