Green. And had he named the correct color, the entire spell would have been countered, including the mana ramp. That would have been brutal!
Ugh. That kind of shit is part of what's terrible about board/card games. Touch Move, Touch Take is a necessary evil, but it's still evil. "Oh I'm sorry, anyone with half a brain knows you would cast your spell in a way that, y'know,
actually makes it do something, but since this is a tournament, tough luck! Free win for your opponent! Yayyyyy!"
In digital turn-based games, especially at one of my favorite sites Yucata.de, the existence of an undo button is just so freakin wonderful. You can do calculations in your head for 20 minutes and still miss something that's painfully obvious once you lay your card on the table, or shoot the gun at the thing. And hey, this was just a preview - now hit Undo or Reset Turn or whatever and do the obvious, sensible thing.
I loathe when I leave up the wrong kind of mana, such that I can't cast
anything in my hand with it, but don't realize this until midway through my turn and oh, nope, you've seen my actions so now you can't fix your error, because there's no way for player B to know for sure that I'm not pulling a fast one.
Except for the fact that we're all (theoretically) friends and I'm not a giant, competitive bag of cocks who would do that - and neither are you, so I'd be happy to extend you the same favor if you ever needed it.
Ugh.
Board games, right?
This is part of what I love about Terra Mystica - sure, it's a little less exciting due to no hidden information, but because there's no hidden information you can always undo your turn and re-jigger it when you realize you have one coin more or less than you thought. The unexpected upside from that lack of hidden info is that, because there's no opportunity for shenanigans, people are suddenly
so nice to each other: are you doing something the hard way or missing an obvious play? It's
very likely that someone else at the table will point it out to you!
That almost never happens in Magic; the environment of bluffing and Instant-speed bombs fosters a mindset during other players' turns of thinking "
please fuck up, please fuck up, I'm just waiting here to exploit every tiniest error and ruin your day, PLEASE make a mistake!" This might be part of why "blue players" have a reputation for being cocks; even if they're nice people, blue cards foster dickish lines of thinking that bleed out into not just your gameplay, but your game manners and persona. Maybe.
But hey, Instants and morphs have a lot of fun gameplay to them, so I guess we're stuck with it!