Wizards of the Coast finally recognized the format in 2011, beginning a deluge of preconstructed decks that are playable right out of the box
However, the most obvious use case for One with the Kami is as part of a game-winning combo
And you can always use it to get some value out of something about to die anyway

Rarity: T Pow/Tgh: // */* Card Type: Token Artifact - Blood // Token Creature - Zombie Artist: Miranda Meeks // Dave Kendall Name: Blood Token // Zombie Token Finish: Foil Card Number: 017/021 // 005/021 Set Name: Innistrad: Crimson Vow Related Products Sigarda's Imprisonment - Foil Innistrad: Crimson Vow Near Mint, English 3 In Stock Near Mint, English 3 In Stock Near Mint, English 3 In Stock Stensia Uprising - Foil - Extended Art Innistrad: Crimson Vow Near Mint, English 6 In Stock Near Mint, English 6 In Stock Near Mint, English 6 In Stock Dying to Serve Innistrad: Crimson Vow Light Play, English 26 In Stock Light Play, English 26 In Stock Light Play, English 26 In Stock Wedding Announcement // Wedding Festivity Innistrad: Crimson Vow Light Play, English 14 In Stock Light Play, English 14 In Stock Light Play, English 14 In Stock Estwald Shieldbasher Innistrad: Crimson Vow Near Mint, English 1 In Stock Near Mint, English 1 In Stock Near Mint, English 1 In Stock Light Play, English 12 In Stock Apprentice Sharpshooter Innistrad: Crimson Vow Light Play, English 12 In Stock Light Play, English 12 In Stock Light Play, English 12 In Stock Edgar, Charmed Groom // Edgar Markov's Coffin - Foil Innistrad: Crimson Vow Near Mint, English 2 In Stock Near Mint, English 2 In Stock Near Mint, English 2 In Stock Blood Hypnotist - Foil - Showcase Innistrad: Crimson Vow Near Mint, English 3 In Stock Near Mint, English 3 In Stock Near Mint, English 3 In Stock

Normally the cards you get are uncommon but theres always a chance that itll be upgraded to a rare or mythic
This triggers Mana Echoes, making two lots of four generic mana (as you have Pashalik Mons, Skirk Prospector, another goblin, and then both goblin tokens entering at the same time)