Vepi, Junkyard Mechanic

At beginning of each player's upkeep, you and that player create a Junk Token. (It's an artifact with "{t},Sacrifice this artifact: Exile the top card of your libary. You may play that card this turn. Activate only as a sorcery")
Whenever an opponent sacrifice a Junk token, create a Treasure token.
{t}{r}{w/u}Sacrifice a Junk Token: Create a token copy of target permanent, except its a 3/3 Junk Vehicle artifact named "Junkster Hotrod" with haste and crew 1