Card Creator technically lets you share cards, but the lack of comments makes it far less than a forum
Lord of the Nazgl is the better Commander to be sure, but you can probably build a cool Rakdos deck with this anyway
1 Rishkar, Peema Renegade
Its a mechanic that cares about certain card types , similar to how cards like Dragon's Claw and Aether Gust care about cards with a particular color

The most effective approach follows the traditional color pie that defines both identity and gameplay mechanics: White - The color of order and protection that focuses on efficient creatures, removal spells, and defensive strategies Blue - The color of knowledge and control that emphasizes card draw, counterspells, and manipulating the game state Black - The color of power and ambition that utilizes life as a resource, creature removal, and graveyard interactions Red - The color of freedom and emotion that delivers fast aggression, direct damage, and chaotic effects Green - The color of nature and growth that ramps mana, plays large creatures, and destroys artifacts and enchantments Colorless/Multicolor - Cards that either require no specific mana or combine multiple colors for hybrid strategies and flexible deck-building options This sets up a very simple organization system: color

Kiora, the Rising Tide Unlike Kiora, Sovereign of the Deep, Kiora, the Rising Tide provides a ton of value in multiple strategies and builds