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.
Teysa Karlov turns every creature death into double value, doubling triggers from Blood Artist effects, Grave Pact, and token-makers to grind the table out. You build a wide board, sacrifice creatures for value, and convert repeated death triggers into life drain and incremental advantage until opponents are bled dry. Token swarms get vigilance and lifelink, letting you attack and block while gaining life.
Doubles powerful death and token-creation triggers for explosive incremental value
Excellent at grinding out long games through repeated sacrifice loops
Strong defensive shell via lifelink/vigilance tokens and edict effects
Deep, well-supported Orzhov aristocrats card pool
Reliant on creatures hitting the battlefield and dying to function
Vulnerable to graveyard hate and board wipes that interrupt loops
Can be slow and grindy against fast combo decks
Teysa herself is a removal magnet and easily targeted