I already checked, there was one reported bug regarding this card, but this is a different animal.
Slaugther pact will win me the game if my opponent doesn't pay (2)(B) during his upkeep, the effect of the card is that I can slay any nonblack creature and I will lose if I don't pay during the (2)(B) my upkeep (Zero mana cost).
So there is that.
Slaugther Pact bug
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Do not post Features/Improvments request here (i.e : AI being stupid is not a bug, not being able to do a mulligan is not a bug, etc..etc..)
Before posting, please read the Bugs reporting guideline
Re: Slaugther Pact bug
Aaaaaaaaaaaaaand unsurprisingly, it also works the other way around, the AI has just won the cheapest of games at turn two.