Laelia, the Blade Reforged is a rare Legendary Creature — Spirit Warrior card from Modern Horizons 3 (MH3), collector number 281. Current market price: $0.34 (foil $0.56), TCGplayer market prices via Scryfall.
Haste Whenever Laelia attacks, exile the top card of your library. You may play that card this turn. Whenever one or more cards are put into exile from your library and/or your graveyard, put a +1/+1 counter on Laelia.