Sephiroth, Fallen Hero is a rare Legendary Creature — Human Avatar Soldier card from Final Fantasy Commander (FIC), collector number 182. Current market price: $1.79 (foil $16.16), TCGplayer market prices via Scryfall.
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.