Second Guess

Instant    (CMC:2)

Counter target spell that's the second spell cast this turn.

"I see where you're going with that. I don't like it."

74 AVR • ENKarl Kopinski

™ & © 1993—2012 Wizards of the Coast

Legal in: Modern,Extended,Innistrad Block,Legacy,Vintage,Freeform,Prismatic,Tribal Wars Legacy,Tribal Wars Standard,Classic,Singleton 100,Commander

Oracle Text (click to copy):

Second Guess {1}{U} Instant Counter target spell that's the second spell cast this turn.

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View this MTG card on Gatherer

5/1/2012
Second Guess can't be cast unless the spell it targets is the second spell cast this turn.
5/1/2012
It doesn't matter if the first spell cast that turn has resolved yet or not. It also doesn't matter how many spells have been cast after the second one, as long as the second spell cast is still on the stack.
5/1/2012
Most spells and abilities that copy a spell create that copy on the stack. These copies are not cast and won't count toward the number of spells cast that turn. However, a few (like Isochron Scepter's ability) instruct you to copy a spell and "cast the copy." These spells are cast and will count toward the number of spells cast that turn.

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