Before I get into the power of Blood Tokens, let us have a look at what a Blood Token is
They then proceeded to top themselves with the subsequent launch of the 25th Anniversary Golden Box [S8a-G], an all-holofoil deck featuring various gold-colored accessories and two Full Art cards covered in gold-colored holofoilincluding this one
Alpharael, Dreaming Acolyte Ancient Excavation Architects of Will Carlo, Suave Schemer Clutch of the Undercity Cyclonus, the Saboteur Dihada's Ploy Dimir Infiltrator Dire Undercurrents Disciple of Deceit Dreadwing Scavenger Emet-Selch, Unsundered Evangel of Synthesis Great Intelligence's Plan Horrid Shadowspinner Jhessian Zombies Kaito Shizuki Kang, Temporal Tyrant Katara, Seeking Revenge Lazotep Chancellor Likeness Looter Locke Cole Mob Lookout Obsessive Stitcher Oskar, Rubbish Reclaimer Perplex Prowler, Clawed Thief Psychatog Psychic Frog Shadowstorm Vizier Soul Ransom Tainted Indulgence The Ancient One Tiger Shark, Abyssal Hunter Tomebound Lich Ultron, Unlimited Unfulfilled Desires Vohar, Vodalian Desecrator
Its ability depends on power, not mana value, so you can reliably get ultra-powerful combo pieces like Kiki-Jiki, Mirror Breaker out if you can get it to the bottom of your library
For example, I can tap [c]Dawnhart Rejuvenator[/c] to add one mana of any color, except the turn that it entered the battlefield
Competitive or casual, doesn't matter, but give us a short reason why