6 mana is a lot, but if you're copying anything worthwhile and bouncing the rest, you're feeling pretty stoked
If two cards that share a color were milled this way, repeat this process
Well, theres one thing this guy can do very well in multiplayer, and thats the flicker at the end of your turn to pop back into play on your next turn
It serves best as a lieutenant for Winota, Joiner of Forces, but any commander thats interested in attacking, building a wide board, or getting artifacts into play should consider this human artificer as a cheap enabler
Junji is a 5/5 with flying and menace and you can force your foes to discard two and lose two life (my default) or reanimate a non-Dragon with casting cost of 4 or fewer, which might have nice value with things like Solemn Simulacrum or Ravenous Chupacabra