It was mostly a tongue-in-cheek comment since Force of Will is notorious from preventing opponents from playing their perfectly structured plan even when they t

It was mostly a tongue-in-cheek comment since Force of Will is notorious from preventing opponents from playing their perfectly structured plan even when they think they've accounted for the target player not being able to cast an instant counter (which traditionally was the case when the target player has no mana available, since most counters cost mana)... so I guess I'm just saying it's not guaranteed to work every time you draw the perfect Turing-complete hand setup because you may be foiled by a counter you don't expect MTG has "stacks", and cards are cast-and-resolved in two separate steps. Which means cards are all cast in sequenced but then resolved in the reverse order they were cast. For example, if Player 1 casts spells A, B, C, and then Player 2 casts instant card D which reads ("cancel the prior spell") in response to Player 1's casting of C, then D resolves by popping C off the stack without C impacting the game at all, then B and A resolve