If Mundo's might is decreased to 1 by 2 copies of Smokescreen (while a card is in trash triggering his ability), then that card leaves trash, what does his might become? And what happens if a third Smokescreen is played after that?

Ruling: When the card leaves trash, Mundo's might becomes 0. If a third Smokescreen is played while Mundo is at 0 might, he remains at 0.

Sequence:

• Mundo starts at 6 might base
• His ability increases him to 7 might (while card is in trash)
• Two Smokescreens resolve, each "snapshotting" their decreases, reducing him to 1 with a total snapshotted decrease of -6
• When the card leaves trash, the -6 decrease no longer has the "minimum of 1" limitation, so Mundo goes to 0 might
• A third Smokescreen played at this point would snapshot as -0, leaving Mundo at 0

Nuances:

• Units can have 0 or less might without dying
• Units only die from non-zero damage, not from having 0 might
• The "minimum of 1" limitation on Smokescreen only applies when the effect resolves and snapshots; once snapshotted, the decrease persists without that limitation