mtg aetherborn cards Ambitious [Mystery Booster] – TokenMTG The Gathering collectible card game Aetherborn - MTG Wiki

In other word its a replica or replaces a card in your deck

When you grab a box from your local game store, you may also receive one of these Buy-a-Box promos (while supplies last): Set Mechanics Casualty

With at least one counter, Inspirit, Flagship Vessel starts to generate its own counters to use in-house or on other artifacts, and with eight or more attached it becomes a 5/5 flyer with hexproof and indestructible benefits to all of your other artifacts

With that said, if you do get full copies of Path, it's worth considering pointing all of them at your own creatures, now that the board is mostly empty, just to get the mana advantage on the table