So, after not having a chance to respond, for the second match in a row, I've lost to my own Pact of Negation Trigger.

Sure, I respect the game is smart enough to realize I can't produce 5 mana, but it is NOT smart enough to recognize the Repudiate, Sublime Epiphany, or other Stifle effects in my hand.

Pretty bold of the game to Assume that "Lose the game" is gonna happen majority of the time pact is cast. Trust me, if im putting a pact on the stack, I probably have a plan.

Tl;dr: Pact of Negation needs to have an upkeep stop. There are several bug reports asking for this. Sheoldred got her's, why cant pact have one?