See Taint by SecretInfiltrator.

This replaces the Contaminated Ground reprint.

Black overall seems very weak to me, but I might be underestimating the power of Rebel Synergies with Lifeless Recreant in relation to the relatively weaker creature suites than normal. The primary issue, in my opinion, seems to be an overabundance of Auras that don't meaningfully contribute to the board, like this one. I like the design, but with the amount of commons you have I would rather see a bunch of cards that affect my opponent immediately, rather than cards such as this and False Counsel which affect the opponent's future decisions.