It gives all Villain characters at the Bad-Anon Location an extra ability
Full Throttle Fury of the Horde Gideon, Martial Paragon Great Train Heist Hellkite Charger Hunting Wilds I Know All, I See All Innocuous Researcher Insurrection Intellectual Offering Intruder Alarm Jace, Ingenious Mind-Mage Jangling Automaton Join Shields Karlach, Fury of Avernus Karrthus, Tyrant of Jund Lightning Runner Llanowar Llanowar Druid Merrow Commerce Mobilize Molten Note Moraug, Fury of Akoum Murkfiend Liege Najeela, the Blade-Blossom Najeela, the Blade-Blossom Najeela, the Blade-Blossom Nature's Will Ohabi Caleria Out of Time Overpowering Attack Paradox Engine Patron of the Orochi Prophet of Kruphix Quest for Renewal Rally of Wings Rally the Troops Raphael, Tag Team Tough Reins of Power Relentless Assault Reset Reveille Squad Riptide Chronologist Roar of the Kha Rude Awakening Rustler Rampage Savage Beating Scourge of the Throne

They are all just Wastes with a bonus ability, but there is a cost to using them as colorless sources due to the inherent tension of the sacrifice effect and using them for mana
Smothering Tithe will give you at least one Treasure a turn unless your opponents pay mana and youll profit either way by slowing them or ramping you
Next up, by my estimation: the Revised dual lands
I like cards that bring variety to game