Later on Phyrexians would have more colour identities than the simplistic "villain = Black Mana" we have here, but it does fit with the idea of Phyrexian power being a dangerous, forbidden Pandora's Box to those that aren't actually receptive to its ideologies and power
Its so full of value that the built-in protection from their ward ability feels like an afterthought
Vorinclex will double its controller's mana from their lands, which is serious mana ramp, but its opposite ability is what makes it such a salty Commander card
Expect a lot of deal-making like I wont attack you this turn if and I can destroy that Propaganda if you attack them this turn. Honorable Mentions Casey & Raph, Hotheads, Donnie & April, Adorkable Duo, Mikey & Mona, Mutant Sitters, and Splinter & Leo, Father & Son each present a great opportunity to do good for others, and are a great bargaining chip
Witness would have been top of the green list back even when Garruk was first released