What will happen with triggered ability of Deputy of Detention on a stack? According to the rule 702.25b cards which are phased-out cant affect and be affected by anything in the game:
If a permanent phases out, it's status changes to phased out. Except for rules and effects that specifically mention phased-out permanents, a phased-out permanent is treated as though it does not exist. It can't affect or be affected by anything else in the game. A permanent that phases out is removed from combat. (See rule 506.4.)
Abilities on the stack are independent of their sources. Deputy did not leave the battlefield, so its exile ability doesn't end before it begins and resolves as normal.
I'm sure the Rulings forum can give you the specific rules that govern this interaction.
We have a dedicated rules forum for this kind of question.
Since the Deputy didn't actually leave the battlefield, it just phased out, the condition for ending the exiling is not met, thus the effect didn't end before it began. So the effect happens when the Deputes trigger resolves, and Teferi is exiled until the Deputy leaves he battlefield. A trigger's resolution does not depend on its source still being around. Though if the Deputy actually left the battlefield, its trigger would do nothing as its effect ended before it began.
610.3 Some one-shot effects cause an object to change zones “until” a specified event occurs. A second one-shot effect is created immediately after the specified event. This second one-shot effect returns the object to its previous zone.
610.3a If the specified event has already occurred when the initial one-shot effect would cause the object to change zones, the object doesn’t move.
702.25d The phasing event doesn’t actually cause a permanent to change zones or control, even though it’s treated as though it’s not on the battlefield and not under its controller’s control while it’s phased out. Zone-change triggers don’t trigger when a permanent phases in or out. Tokens continue to exist on the battlefield while phased out. Counters remain on a permanent while it’s phased out. Effects that check a phased-in permanent’s history won’t treat the phasing event as having caused the permanent to leave or enter the battlefield or its controller’s control.
last weekend I've got in a dispute about phasing. I had in play Teferi, Master of Time, opponent casts Deputy of Detention and target's Teferi, Master of Time.
Now, I used Teferi, Master of Time ability: minus 3: Target creature you don't control phases out.
What will happen with triggered ability of Deputy of Detention on a stack? According to the rule 702.25b cards which are phased-out cant affect and be affected by anything in the game:
If a permanent phases out, it's status changes to phased out. Except for rules and effects that specifically mention phased-out permanents, a phased-out permanent is treated as though it does not exist. It can't affect or be affected by anything else in the game. A permanent that phases out is removed from combat. (See rule 506.4.)
So what my opinion about this is:
Deputy of Detention enter's battlefield, target's Teferi, Master of Time
Teferi, Master of Time uses minus 3 ability targets Deputy of Detention
Nothing else is added on stack.
Teferi, Master of Time minus 3 ability resolves. Deputy of Detention is phased out.
Deputy of Detention ability resolves. It's phased out and according to rules it is treated as though it didn't exist (aka same situatuion, If I destroy Deputy of Detention) and it can't affect and be affected by anything in game.
My friend tried it in online Magic the gathering: Arena, where behaviour is that targeted permanent is exiled, even it's phased out.
What's your opinion on this?
I'm sure the Rulings forum can give you the specific rules that govern this interaction.
Since the Deputy didn't actually leave the battlefield, it just phased out, the condition for ending the exiling is not met, thus the effect didn't end before it began. So the effect happens when the Deputes trigger resolves, and Teferi is exiled until the Deputy leaves he battlefield. A trigger's resolution does not depend on its source still being around. Though if the Deputy actually left the battlefield, its trigger would do nothing as its effect ended before it began.
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