Sephiroth, Fallen Hero
Jenova Cells — Whenever Sephiroth attacks, you may put a cell counter on target creature. Until end of turn, each modified creature you control has base power and toughness 7/5. (Equipment, Auras you control, and counters are modifications.) The Reunion — {3}, Sacrifice a modified creature: Return this card from your graveyard to the battlefield tapped.
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Official rulings (4) · Scryfall
An Aura controlled by another player does not cause a creature you control to be modified.
A creature that is equipped is considered modified no matter who controls the Equipment that's attached to it.
A creature with a counter on it is considered modified no matter what kind of counter it is or which player put it on that creature.
Sephiroth's first ability will overwrite any previous effects that set the creature's power and toughness to specific numbers. Effects that otherwise modify its power and toughness will still apply no matter when they took effect. The same is true for +1/+1 counters.