Mishra's Factory + Bridge from Below

[Infinitium]

I animate and somehow kill my own Mishra's Factory. Will it still be a creature when it reaches the graveyard and trigger Bridge From Below?

[Filth]

Yes. The game looks back in time to see if Bridge should trigger, and the Factory was a creature when it was still on the battlefield.

I believe this is the rule that covers this:


603.6d Normally, objects that exist immediately after an event are checked to see if the event matched any trigger conditions. Continuous effects that exist at that time are used to determine what the trigger conditions are and what the objects involved in the event look like. However, some triggered abilities must be treated specially because the object with the ability may no longer be on the battlefield, may have moved to a hand or library, or may no longer be controlled by the appropriate player. The game has to “look back in time” to determine if these abilities trigger. Leaves-the-battlefield abilities, abilities that trigger when a permanent phases out, abilities that trigger when an object that all players can see is put into a hand or library, abilities that trigger specifically when an object becomes unattached, and abilities that trigger when a player loses control of an object will trigger based on their existence, and the appearance of objects, prior to the event rather than afterward.(Leaves-the-battlefield abilities include "is put into a graveyard from the battlefield" abilities.)