So, after playing with my local playgroup one of them brought up something he had heard regarding negation of abilities that I wanted to clarify because it sounded very off. Basically it was a technicality on when an ability can be negated.
The issue was this. I had a copy of chester's backing and my opponent had a copy of chinese boxing in play. On his attack he opted to use his first Enhance using the boxing to target one of my foundations. His claim was that I had choose to use chester's backing before he chose the target for chinese boxing. His reasoning was that once the effect of the chinese boxing allowed him to choose the foundation that the effect had already resolved and that the window to cancel it had passed already.
I promptly stated that the ability hasn't been played until all costs and effects have resolved and that chesters will negate the ability only after it has reached the resolution step, ie after he chose the foundation. Chester's exact wording (and the wording of most negation cards) reads 'after an ability has been played'. An ability hasn't been played until it's costs have been paid and its effects have reached the resolution step, correct?
So my question is whether or not my opponent was trying to weasel his way into getting a free shot off of chinese boxing or was he correct. I'm 99% sure that he's wrong but I wanted to make sure.