Black has always had to give up something to draw cards
Aurelia, the Law Above Aurelia, the Law Above ignores whatever laws Magic R&D used to have about Boros card draw and establishes a new one that is so much easier
The only thing rivaling the blue one mana card quality spells as support tools
There just happens to be a six power creature in the same set as Fight Rigging that only costs three mana: Shakedown Heavy
Animar, Soul of Elements Averna, the Chaos Bloom Beluna Grandsquall Borborygmos and Fblthp Eshki Dragonclaw Eshki, Temur's Roar Flubs, the Fool Gimbal, Gremlin Prodigy Illuna, Apex of Wishes Illuna, Apex of Wishes Intet, the Dreamer Iroh, Grand Lotus Kalamax, the Stormsire Loot, the Key to Everything Loot, the Pathfinder Maelstrom Wanderer Magus Lucea Kane Me, the Immortal Miirym, Sentinel Wyrm Omnath, Locus of the Roil Pia Nalaar, Chief Mechanic Rashmi and Ragavan Riku of Many Paths Riku of Two Reflections Saheeli, Radiant Creator Storm, Force of Nature Surrak Dragonclaw The Swarmlord Ureni of the Unwritten Ureni, the Song Unending Xyris, the Writhing Storm