Having multiple artifacts with the same name is easier these days due to the prevalence of Treasures, Clues, and Food tokens, but youll still need this card alive on the battlefield enchanting an artifact to do the trick
You can print MTG proxy cards at home, or by using a service such as PrintMTG, where you can import decks and print them on demand
In recent weeks, however, that value has fallen somewhat, with the price now sitting at just $13.19 6 | Invasion of Tarkir | $13.14 6 | Invasion of Tarkir | $13.14 Once worth just $8.21, Invasion of Tarkir has steadily been increasing in value over the past few weeks
For Mythics, you absolutely MUST take every Mythic you have less than 4 of
It gives all your creatures +1/+1, trample, and infect until end of turn
As a general purpose card you should avoid this but now and again it is just the ticket