Raging Bull Rarity: Common TYPE: Creature SUBTYPE: Ox CMC: 3 Mana cost: USD: $0.84 EUR: 1.44 TIX: 0.00 EDHREC RANK: 26841 (2/2) Ragnar Rarity: Uncommon TYPE: Legendary Creature SUBTYPE: Human Cleric CMC: 3 Mana cost: USD: $24.20 EUR: 29.11 TIX: 0.00 EDHREC RANK: 27585 (2/2) , : Regenerate target creature
It's very strong at the kitchen table and you can check it out here - Getting Nasty in Commander with Nashi | Article by Abe Sargent (coolstuffinc.com) The sixth deck I built was a Mono-Blue Artifacts list built around Katsumasa, the Animator

Azra Smokeshaper Biting-Palm Ninja Dark Leo & Shredder Dokuchi Shadow-Walker Dokuchi Silencer Elektra, Daughter of the Hand Fallen Shinobi Foot Elite Foot Mystic Foot Ninjas Heroes in a Half Shell Ingenious Infiltrator Ink-Eyes, Servant of Oni Inkrise Infiltrator Karai, Future of the Foot Kotose, the Silent Spider Krang & Shredder Masterful Ninja Mukotai Ambusher Nashi, Moon Sage's Scion Nashi, Searcher in the Dark Nezumi Prowler Ninja Ninja of the Hand Ninja of the New Moon Okiba-Gang Shinobi Orochi Soul-Reaver Oroku Saki, Shredder Rising Overt Operative Satoru Umezawa Satoru, the Infiltrator Shark Shredder, Killer Clone Shredder, Shadow Master Shredder, Unrelenting Silent-Blade Oni Silver-Fur Master Skullsnatcher Splinter, Hamato Yoshi Splinter, Radical Rat Splinter, the Mentor Super Shredder Tatsunari, Toad Rider Throat Slitter Throatseeker Undead Hand Ninja Yuriko, the Tiger's Shadow Yuriko, the Tiger's Shadow
Mostly, that is
Rampaging Rendhorn Rampaging Rendhorn is by far the weakest card with riot