Stifle Laboratory Maniac Trigger

[sippingcider]

Just was thinking of the weird human flip deck into library and its weaknesses, and wondered if this was possible:

When attempting the final draw with Laboratory Maniac in play, can someone stifle the "win the game" trigger and thus cause you to lose? Or is his ability even a triggered ability?

[ween]

I believe it's a replacement effect, not a triggered ability?
At any rate, if you can respond to it, they can respond by tapping another human with Azami (like herself, an undercity informer or wild cantor) to trigger it again.

[JPoJohnson]

I also believe it's a replacement effect. "Instead of losing, you win". I don't think you can Stifle that.

[cdr]

"When", "whenever", "at" = triggered ability.

"Instead" = replacement effect.