Multi Rulings.

I had a topic like this before, so i wouldnt have to spam topics, but for some reason it was Solved, and locked, which doesnt make much sense.
Anyways.

1. My opp attacks with Gaia, i use D-prison, he uses E-controller to switch gaia into defense, does that safe gaia, or no?

2. Is this a correct chain? Opp summons Trishula, i chain with Mask change, then i chain with Super poly, the only monster on my field would be E-hero Ocean.
Since the chain goes backwards, would it go
Fuse Ocean +Trish into A-Zero, Mask change into Acid, Trishula eff, then Complete field bomb from both Acid and Zero?

1. No because E-Con cannot be used to change your own monster to defense position. If a monster is changed to defense as a response to D-Prison it works though, since the monster is no longer the attacking monster.

2. No. Mask Change targets as a "cost". Thus, Super Poly would go through, Mask Change would lose it's target, then Trish would go through.

I assume you are wrong at the first ruling Miror B.

1. Dimensional Prison targets the monster it has to banish. You are making a false analogy with Book of Moon, which sets the monster face-down, hence basically removing its identity from the field and rendering it unrecognizable. On the other hand, any other way of changing the monster position(Zero Gravity, for example) will NOT save the monster from being banished.

Supreme_King wrote:I assume you are wrong at the first ruling Miror B.

1. Dimensional Prison targets the monster it has to banish. You are making a false analogy with Book of Moon, which sets the monster face-down, hence basically removing its identity from the field and rendering it unrecognizable. On the other hand, any other way of changing the monster position(Zero Gravity, for example) will NOT save the monster from being banished.

Dimensional Prison says "Banish the attacking monster". If a monster is in Defense Position, it is no longer attacking. That's the reasoning behind BoM stopping it.

It also doesn't go through if the monster changes control through TG1 EM1, because it is no longer "the attacking monster"

The monster is attacking, and Dimensional Prison targets him upon activation. After that, unless the monster is removed from the field, it still remains a target for it. The reason behind Dimensional Prison being stopped by Book of Moon is that the monster "disappears" from the field due to it being flipped face-down.

^^My personal opinion on the mechanics involving this case.

by your logic on the mechanics you also couldn't mind control a monster if book of moon was chained...

the fact that the monster is now in face down def doesn't change the fact, that it is still targeted. It is like Miror says^^

Supreme_King wrote:The monster is attacking, and Dimensional Prison targets him upon activation. After that, unless the monster is removed from the field, it still remains a target for it. The reason behind Dimensional Prison being stopped by Book of Moon is that the monster "disappears" from the field due to it being flipped face-down.

^^My personal opinion on the mechanics involving this case.

Wiki says Book stops it because the monster is no longer attacking.

As Dest says, this logic would stop Mind Control or Brain Control from stealing a monster that got booked because it "disappeared".

If a monster is no longer in attack position, or has something that prevents it from attacking equipped, it is no longer "the attacking monster", so cards like D-Prison and Sakuretsu would resolve without effect since they specify "the attacking monster".

potential reason for the locking of prev topic http://forum.duelingnetwork.com/t12187-another-read-before-posting-thread-making-and-replying-to-topics

Miror B. wrote:2. No. Mask Change targets as a "cost". Thus, Super Poly would go through, Mask Change would lose it's target, then Trish would go through.

Costs never targets

Key wrote:

Miror B. wrote:2. No. Mask Change targets as a "cost". Thus, Super Poly would go through, Mask Change would lose it's target, then Trish would go through.

Costs never targets

Hence why cost was in quotes. The targeting happens at activation, the same time costs would be paid. It's not an actual cost, but saying it's not can confuse people into thinking it doesn't target until resolution.

Which is misleading just like targeting hand with Trishula
It's a no no

Summarize for that, you pay cost and choose the target at the activation of an effect if that effect targets.