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Jace, Architect of Thought's -1/0 ability does not disappear in one turn.
If use the same ability the next turn in that state, it will be handled incorrectly and a 4/4 token of Rukh Egg will appear at the end of the turn.

Fixed. This will affect all persistent effects that trigger on declare attackers, so if you see something similar it's probably a duplicate bug.
EDIT: fixed in 6c4f5d0