Maarika, Brutal Gladiator is a rare Legendary Creature — Human Warrior card from Secret Lair Drop (SLD), collector number 435. Current market price: $12.49 (foil $13.42), TCGplayer market prices via Scryfall.
Maarika, Brutal Gladiator must be blocked if able. As long as it's your turn, Maarika has indestructible. Whenever Maarika deals damage to a creature, if that creature was dealt excess damage this turn, that creature's controller sacrifices a noncreature, nonland permanent.