My question is to whether or not a player could use blind seer's ability to change the colorization of a spell being cast by an opponent to increase the casting cost of that spell with Invoke Prejudice in play. My question also applies to spells like Douse and hydroblast with seer in play to act as a hard counter.
This doesn't work for Invoke Prejudice, but it does work for Douse and Hydroblast.
By the time you get priority to respond to an opponent's spell and use Blind Seer to change its color, the opportunity for Invoke Prejudice to trigger off the spell being cast has passed. Invoke doesn't go back and trigger when a spell changes color.
You can, however, activate Blind Seer's ability and let it resolve, changing the color of the spell, then cast/activate something else that looks for the spell being a particular color while the spell is still on the stack.
No, Invoke Prejudice will only trigger if the conditions for the trigger are met. So when you cast the spell, the game checks whether or not the spell shares a color with creatures you control. If it does, then the ability never goes on the stack. Blind Seer will do nothing there.
However, it will work with Hydroblast as long as Blind Seer's ability resolves first. Same with Douse, however, you can't activate Douse until the spell has turned Red from the Seer.
Why does Douse work and not the other? is it because it only checks the color when you announce the spell? What is the exact sequence of casting a spell? and when would the enchantment check? Sorry if this is a dumb question.
Douse works because it's not a triggered ability. It just requires you to have legal target when you activate the ability. You're able to change the color of the spell on the stack, and then while that spell is still on the stack, you're able to now activate Douse targeting that spell since it's now a legal target.
Invoke Prejudice has a triggered ability. The trigger condition is "an opponent casts a creature spell that doesn't share a color with a creature you control." That trigger condition can only be met at a specific moment, which is just after the costs have been paid for a spell and it is considered "cast" by the game. At that moment, the spell is still its original color, so the ability doesn't trigger. Changing the color of the spell on the stack doesn't cause it to be "cast" again, so there's no way to retroactively trigger Invoke Prejudice this way.
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Douse works because it's not a triggered ability. It just requires you to have legal target when you activate the ability. You're able to change the color of the spell on the stack, and then while that spell is still on the stack, you're able to now activate Douse targeting that spell since it's now a legal target.
Invoke Prejudice has a triggered ability. The trigger condition is "an opponent casts a creature spell that doesn't share a color with a creature you control." That trigger condition can only be met at a specific moment, which is just after the costs have been paid for a spell and it is considered "cast" by the game. At that moment, the spell is still its original color, so the ability doesn't trigger. Changing the color of the spell on the stack doesn't cause it to be "cast" again, so there's no way to retroactively trigger Invoke Prejudice this way.
Thanks a lot for clearing that up
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By the time you get priority to respond to an opponent's spell and use Blind Seer to change its color, the opportunity for Invoke Prejudice to trigger off the spell being cast has passed. Invoke doesn't go back and trigger when a spell changes color.
You can, however, activate Blind Seer's ability and let it resolve, changing the color of the spell, then cast/activate something else that looks for the spell being a particular color while the spell is still on the stack.
However, it will work with Hydroblast as long as Blind Seer's ability resolves first. Same with Douse, however, you can't activate Douse until the spell has turned Red from the Seer.
Invoke Prejudice has a triggered ability. The trigger condition is "an opponent casts a creature spell that doesn't share a color with a creature you control." That trigger condition can only be met at a specific moment, which is just after the costs have been paid for a spell and it is considered "cast" by the game. At that moment, the spell is still its original color, so the ability doesn't trigger. Changing the color of the spell on the stack doesn't cause it to be "cast" again, so there's no way to retroactively trigger Invoke Prejudice this way.
This FAQ answers many of the common questions asked in the MTGS Rulings forum. Take a look!
I'm the editor/content manager of the Magic Rules Tips Blog - Bookmark this site for daily tips about game and tournament rules.
"Abstract concepts of perfect judging run headlong into the realities of how people play the game." - Toby Elliott (papa_funk)
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Thanks a lot for clearing that up