Fetch Lands are especially crucial, because even though they're expensive, they can help get you the mana you need at a moment's notice
Kronk, Junior Chipmunk The damage, the damage meant for Kuzco Though he may have a reputation as a lovable himbo in The Emperors New Groove, Kronk in Rise of the Floodborn is decidedly nastier
In my Top 20 cards from Kaladesh list I definitely had Revolutionary Rebuff ranked too highly, as it turned out not being able to counter artifacts was a massive downside that limited the amount of play it saw
Regardless, Gravecrawler is there to provide one-mana sac fodder, opening up combo opportunities and generally doing everything but blocking
If your Magma Jet gets a card twice, makes two Elemental tokens, and scrys 2 twice, you are in a good place