Teysa Karlov is a rare Legendary Creature — Human Advisor card from Ravnica Allegiance (RNA), collector number 212. Current market price: $2.47 (foil $4.37), TCGplayer market prices via Scryfall.
If a creature dying causes a triggered ability of a permanent you control to trigger, that ability triggers an additional time. Creature tokens you control have vigilance and lifelink.