Say my opponent pays 5, sacs 5 creatures, and transforms Westvale Abbey into ormendhal. This activated ability would be placed on the stack correct? Now in response, lets say I cast an Ultimate Price and destroy one of his 5 creatures that he sacked.
My first question is: am I allowed to do this?
My second question is: When the stack resolves, one of his creatures will be destroyed leaving him with 4. Then when Abbey's ability resolves, will it not be legal anymore since he doesn't have 5 creatures to sac? So his remaining 4 creatures will be sacked and his mana will stay tapped? Or does the game state roll back since he legally can't use the ability? And his remaining 4 creatures would stay on the field. HELP MEEEE
Sacrificing the creatures is a cost paid when activating the ability, not upon resolution of the ability, therefore you cannot destroy one before he has already sacrificed it from paying the cost to activate the ability. Pretty much anything he does BEFORE the : sign is done before anyone can do anything else.
And does this also include when a spell is cast on an illegal target?
Yes, if someone tries to cast a spell on an illegal target, the whole play is rewound and is considered to never have happened. However, if the spell is legally cast, THEN targets become illegal in response to the spell, the spell will be countered upon resolving if all of its targets are illegal, and if some targets are illegal and some legal, it resolves but it doesn't affect any illegal targets.
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I'm a former judge (lapsed), who keeps up to date on rules and policy. Keep in mind that judges' answers aren't necessarily more valid than those of people who aren't judges; what matters is we can quote the rules to back up our answers. When in doubt, ask for such quotes.
Sure. Removing Westvale Abbey from the battlefield causes any actions that would be performed on it as a result of the ability to be impossible to perform.
If the ability did anything else, those other effects would still happen (since the ability doesn't target and thus won't be countered on resolution, it will still do everything it can. But in this case, that's nothing.)
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Say my opponent pays 5, sacs 5 creatures, and transforms Westvale Abbey into ormendhal. This activated ability would be placed on the stack correct? Now in response, lets say I cast an Ultimate Price and destroy one of his 5 creatures that he sacked.
My first question is: am I allowed to do this?
My second question is: When the stack resolves, one of his creatures will be destroyed leaving him with 4. Then when Abbey's ability resolves, will it not be legal anymore since he doesn't have 5 creatures to sac? So his remaining 4 creatures will be sacked and his mana will stay tapped? Or does the game state roll back since he legally can't use the ability? And his remaining 4 creatures would stay on the field. HELP MEEEE
Thanks a lot!
Standard - Some kind of control
Modern - UB Mill (casual)
EDH - Meren's Grave Shenanigans
If the ability did anything else, those other effects would still happen (since the ability doesn't target and thus won't be countered on resolution, it will still do everything it can. But in this case, that's nothing.)