Lightning, Army of One is a mythic Legendary Creature — Human Soldier card from Final Fantasy (FIN), collector number 233. Current market price: $8.48 (foil $12.27), TCGplayer market prices via Scryfall.
First strike, trample, lifelink Stagger — Whenever Lightning deals combat damage to a player, until your next turn, if a source would deal damage to that player or a permanent that player controls, it deals double that damage instead.