Sita Varma, Masked Racer is a rare Legendary Creature — Human Rogue card from Aetherdrift Promos (PDFT), collector number 223p. Current market price: $0.29 (foil $0.25), TCGplayer market prices via Scryfall.
Exhaust — {X}{G}{G}{U}: Put X +1/+1 counters on Sita Varma. Then you may have the base power and toughness of each other creature you control become equal to Sita Varma's power until end of turn. (Activate each exhaust ability only once.)