Random Creature Death
Was playing with an arms scavenger equipped with a mirror shield and dueling rapier and Raiyuu, storm's edge on the battlefield. Attacked with arms scavenger twice as per Raiyuu's ruling. After having attacked twice, i then paid 1 mana (reduced mana cost from arms scavenger) to equip the mirror shield onto Raiyuu. For some reason, de-quipping the mirror shield from arms scavenger caused them to die, out of nowhere, despite having seemingly no reason to.
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Rezzahan#77802 commented
Damage that a creature receives stays marked on it until the cleanup step. Which means, if the toughness gets reduced, for example bymoving a toughness raising equipment somewhere else, that damage can become lethal, and state based actions destroy the creature.