Your tokens dont really work with [mtg_card]Whitemane Lion[/mtg_card] or [mtg_card]Twilight Shepherd[/mtg_card], since tokens disappear when they hit the graveyard or go to your hand
You can lead a deck with him, but he's mono-Blue so you'd need a good tribe like Merfolk or his Illusion type
This means a Dragons Approach deck will have one of the lower answers to how many copies is too many you just need more non-signature cards to make the list function
The other notable one is Hostile Hostel, which can transform into Creeping Inn, a 3/7 horror construct that exiles a creature card from a graveyard when it attacks, before each opponent loses X life and you gain X life, with X being the number of creatures it has exiled
You should label the boxes with sticky notes, not by writing on the boxes, as your collection will grow
Often players would use a card like Tinker to search out any artifact at all, with options that cost far more mana