Mythweaver Poq/Scapeshift
While playing against a deck using Mythweaver Poq as the commander, my opponent played Scapeshift and sacrificed all of their lands. This action caused the power and toughness for Mythweaver Poq to hit 0/0 prior to the searched lands hitting the battlefield. This should have killed Mythweaver Poq, but it did not.

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Rezzahan#77802 commented
State based actions aren't checked during the resolution of a spell or ability. And a creature dying for having 0 or less toughness is a state based action. Since the sacrificing and searching and putting out the lands all happens during resolution of Scapeshift, the Poq is fine. If the sacrifice of the lands had instead been an additional cost, the Poq would have died.