Teysa Karlov is a rare Legendary Creature — Human Advisor card from Ravnica Allegiance Promos (PRNA), collector number 212p. Current market price: $3.63 (foil $6.50), 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.