It encourages players to play Wizards, Fighters, Rogues, and Clerics, but also asks them to play them in equal proportion, which prevents them from hitting the required density for most tribal effects
The Bonus card for this one is Kezzerdrix, reskinned as the Killer Rabbit of Caerbannog
Ninjas were the most successful and well-liked aspect of the original Kamigawa block, and until we started adding more Ninjas through supplemental sets, Ninja of the Deep Hours was the one most responsible for flying that hard-to-detect flag playing significant roles in Pauper and Cube as well as Commander
This can lead to plenty of extra mill over the course of a long game, especially in Commander, where this adds each-opponent mill to any instances of single-target mill
You should learn what golden packs are and if the mastery passes are worth it
Or you can get back a powerful creature you need to clinch your victory