Machinists Arsenal Machinist's Arsenal requires a bit of building around, but it takes just one or two other artifacts for it to be good
Once you've picked your second themeboom, you're done
This allows them to play more powerful cards as well as removal and discard spells to answer their opponents cards
But if you cast the adventure spell, the card is exiled when it resolves and then you can cast the creature from exile after
The release of Lost Caverns of Ixalan featured a normal amount of variants, with Neon Ink being the ultimate chase, while adding Universes Beyond Jurassic World and Special Guest Magic: The Gathering cards that are all worth money as singles
Craft with Cave (, Exile this artifact, Exile a Cave you control or a Cave card from your graveyard: Return this card transformed under its owner's control