MTG: who controls XXX now?

Once a creature leaves the battlefield, the game loses all track of it and it's considered a brand new object. Once Unhallowed Pact returns the creature to the battlefield, it's no longer counted as the same creature affected by Traitorous Blood. So you keep the creature.

Three things to consider here:

1) Traitorous Blood doesn't say "return that creature to its owner's control at the end of the turn" The effect simply ends, and therefore could not override anything after that.

2) Unhallowed Pact's effect was applied most recently, so in any conflict between effects, it would take precidence.

3) When a permanent changes zones (like moving from the battlefield to the graveyard), the game loses track of it's previous state and it is like it is a completely different permenant. So when XXXX returns to the battlefield, the game has no idea that it was ever affected by Traitorous Blood.

I've played a couple card games, and MTG is my fav. And based on my experience with them, The Golden Rule seems to be you follow the sequence chronologically, and literally, to the word.

The way I see it, you gained control of XXX for the remainder of your turn, then sacrificed it, sending it to the graveyard and ending any effects on it, THEN Unhallowed Pact activates, then XXX returns to you, under a new set of conditions. Traitorous Blood's effect ended when you lost control of the card to the graveyard. I'm no expert but that's my interpretation.

Once the creature dies, Traitorous Blood's trigger will no longer matter, as the new creature returning to play is a different one by the rules.

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