Light Transmission If the suspicious card is genuine, it should let just as much light through as a genuine MtG card
When PSA 9 Is the Better Buy Far more often than people realize, the PSA 9 is the smarter purchase
While that idea stayed the same, the shape of job select changed a lot throughout the design process
By this, I mean playing it on a turn where they can play another spell which will either protect it, or in some way synergize to gain some incremental value knowing the creature is likely to die or be exiled very soon
So if you really want to know what promos are Pauper legal, you have to find a list of all common Magic Online promos then MANUALLY LOOK UP EACH CARD to see if it has other online printings (in which case it isn't legal), unless one of those other printings is at Common (in which case it is legal)
But this is a fantastic way of getting more monsters on your field to summon with, be it tribute, link, synchro, or whatever type of summon you feel like