if i use the first enhancement on red gi to look at my opponents hand and choose a card, will they be able to play any copy of that card if they have more than one? how am i to know that the copy of the card i chose isnt the copy being played, i just need a little more clarification on this ability. If they have more than one copy, can they still play one of the other copies?

it targets the card, so its 1 specific card. not including the copies of the card.

in general when my group played it we just set the card on the table face down or up, doesnt matter much, to signify exactly which it was.

note the errata to include the unique keyword

i just made it so it was backwards in my hand

Stamps. Red Gi involves a little bit of the Voodoo Magick to work, but those are some ways to make sure it doesn't go haywire.