Suggested card re-wording:"Target creature gains +X|-X and 'immaterial'. X = target creature's HP."(Conditionally suggested upon agreement with my prior post)
You put up a SoP and it lives.
"Target creature you own gains +X|-X and 'immaterial'. X = target creature's HP. Destroy it once your turn ends."I suggest you change it to only your creatures otherwise it is an autokill card.