I was playing a game with a relative and we were trying to hold ourselves to choices to better ourselves for a vault tour because you won't be able to undo your decisions and a fairly dumb rules question came up... I am prepared to make a ton of aember with all the sanctum cards in my hand, and who knows why but logos came out of my mouth... I have no logos cards in hand and one library of babble on the field, I haven't decided to pick up my archives yet and seconds after it say something like "not logos but sanctum" if I go to a vault tour will I be held to sticking to logos when I haven't moved on to playing any cards or using creatures or even picking up my archives?

2 hours ago, JaysCDandHobby said:

I was playing a game with a relative and we were trying to hold ourselves to choices to better ourselves for a vault tour because you won't be able to undo your decisions and a fairly dumb rules question came up... I am prepared to make a ton of aember with all the sanctum cards in my hand, and who knows why but logos came out of my mouth... I have no logos cards in hand and one library of babble on the field, I haven't decided to pick up my archives yet and seconds after it say something like "not logos but sanctum" if I go to a vault tour will I be held to sticking to logos when I haven't moved on to playing any cards or using creatures or even picking up my archives?

It depends on a few things. If your opponent doesn't care, there's no problem. As a Magic judge, I was trained to accept a play as made or announced unless it was clear that it was a vocal or dexterity error. In other words, immediate changing "Logos -- no, Sanctum!" will probably be accepted as fine, but "Logos ... (10 seconds go by)... no, let's do Sanctum instead" probably won't. In a less formal event I would go so far as to say that if no actions are taken, the house can be changed, but that's not something I can say for every judge or marshal.

Not a judge myself, but even in a competition, we're not immune to brainfarts. I tend to be OK with people fixing a major mistake like that, but not when cards have been played in the wrong order for example.

Honestly? With the lack of instant effects, I don't think it really matters what people say until they start playing or exhausting. Telling your opponent what House you're choosing is more of a courtesy since you'll be making all the choices. Most they can do is keep you honest (only activating cards from that House and omni effects).