Would it be possible to use the scheme My Laughter Echoes on Plots that Span Centuries to make it so that the next two times I would set a scheme i motion I set three in motion instead?
Not quite, but these cards do combo in a fun way.
When you choose to abandon My Laughter Echoes, its effect will set Plots That Span Centuries into motion a second time. (Its first trigger hasn’t resolved yet, so it doesn’t affect this action.)
Once both triggers from PTSC have resolved, there will be two separate replacement effects looking to affect the next time a scheme would be set in motion.
The next time you would set a scheme into motion, both replacement effects want to modify the event. Applying the first effect will change “set a scheme in motion” into “set three schemes in motion”, which is really just “set a scheme in motion, set a scheme in motion, set a scheme in motion” since setting schemes in motion can only happen one at a time, like drawing cards. The second replacement effect will then replace the first instance of setting a scheme in motion with setting three schemes in motion again. The net result is that you’ll set five schemes in motion at that time.
