Kamigawa

Kamigawa was the 10th block released for Magic the Gathering. It takes place in the titular plane. It introduced the the Ninjutsu mechanic, which is awesome. The block came after Mirrodin block, which was one of the largest and stinkiest blocks of cheese Magic had ever seen. Subsequentially, CoK-block was well below the general power curve compared with other sets. Which may seem remarkable when you consider some of the cards below, but those were literally all this block had going for it.

The Plane Proper

Kamiagawa is Magic's Oriental Adventures setting; a fantasy realm based upon Japanese mythology, most prominently in the form of being divided into two realms, one inhabited by mortals and the other inhabited by Kami -primal spirits who embody the various elements, objects and other aspects of the material realm. The Kakuriyo or Reikai is the spirit world where the kami dwell; its other half is that of the Utsushiyo where mortals live. Utsushiyo is divided into five lands which correspond to the five Colors of Magic.

Native races of Kamigawa consist of: Humans, Soratami, Orochi, Kitsunes, Nezumi, O-bakemono and Akki.

Notable Cards

Expert commentary taken from the Gatherer

Sensei’s Divining Top

It looks so innocent the first time you read it too. It's not. Not even a little bit. -Shadow1798

Multiple copies can be used for some infinite loops among many other abuses.

Kiki-Jiki, Mirror Breaker

This card makes too many ridiculous infinite combos. - alblast

Umezawa's Jitte

Fun fact: "Umezawa's Jitte" can be approximately translated to English as "You're f*cked, game two." -ratchet1215

Aside from easily burning away 1/1s, it also make a creature really powerful really quick. Can gain counters even faster if put on something with double strike.

Pithing Needle

I love just stuffing people who overuse fetchlands. -WhiteyMcFly

Isamaru, Hound of Konda

With the right draws, he's capable of winning an EDH game in 4 or 5 turns. -JaxsonBateman

His low cost and high power makes him good at abusing EDH's commander damage victory condition. A deck full of cheap buffs that improve that strength further and make him hard to block can achive victory quite quickly in an otherwise slow format.

Gifts Ungiven

It has it all:
It's a tutor.
It's card advantage.
It's an instant. - scumbling1

Cranial Extraction

One of the most iritiating/cruel spells in whole MTG. - True_Smog

Blue knows they deserved this. Too bad it never lands. - Piroko

Neon Dynasty

Kamigawa Neon Dynasty is a different take on a Japanese themed world. Part of Japanese cultural is the dualism between modernity and tradition (hence the popularity of Fiddler on the Roof in Japan). In Neon Dynasty, tradition is represented by enchantments and modernity is represented by artifacts. In terms of lore, the world is set over a thousand years in the future of old Kamigawa, so you see some old Kamigawa is visible, especially on the tradition side of things. Also the world has vehicles in the form of mechas.

Settings of Magic: The Gathering
Pre-revisionist:	First Magic Sets - First Urza Block - Arabian Nights Legends - Homelands - Ice Age - Mirage
Weatherlight Saga:	Portal Starter Sets - Second Urza Block Tempest Block - Masques Block - Invasion Block
Post-Weatherlight:	Otaria Block - Mirrodin - Kamigawa - Ravnica - Time Spiral
After the Mending:	Lorwyn - Alara - Zendikar - New Phyrexia Innistrad - Return to Ravnica - Theros - Tarkir - Eldraine - Ikoria
Two-Block Paradigm:	Kaladesh - Amonkhet - Ixalan
Post Two-Block Paradigm:	Eldraine - Ikoria - Kaldheim - Strixhaven
Never in a standard set:	Fiora (Where the Conspiracy sets take place) - Kylem (Battlebond)