This makes it slightly better in terms of utility and also slightly easier to summon
This party-loving Streets of New Capenna faction is all about bringing people together, so naturally Jetmir's abilities are themed around playing lots of creatures
2: Target artifact you control becomes a copy of another target artifact or creature you control until end of turn, except its an artifact in addition to its other types
While maintaining classic rarity symbols, it expanded the ultra rare category significantly with GX cards and introduced Rainbow Rare variants cards featuring a prismatic, multi-coloured holofoil treatment
Throw in a few more Rat token generators like Piper of the Swarm or Ogre Slumlord and get ready to overrun the table with Rats
Just casting this will probably give you something back from your graveyard, and if you already have a mill engine going or dredge cards in your graveyard, the hell gates are open