Lathril, Blade of the Elves is a rare Legendary Creature — Elf Noble card from Foundations (FDN), collector number 349. Current market price: $5.55 (foil $21.51), TCGplayer market prices via Scryfall.
Menace (This creature can't be blocked except by two or more creatures.) Whenever Lathril deals combat damage to a player, create that many 1/1 green Elf Warrior creature tokens. {T}, Tap ten untapped Elves you control: Each opponent loses 10 life and you gain 10 life.