When Lobelia enters, exile target creature card from an opponent's graveyard that was put there from the battlefield this turn, then create X Treasure tokens, where X is the exiled card's power.
Lobelia is a mono-black graveyard-hating value engine: flash her in (often as removal punishment) in response to an opponent's creature dying, exile it from their graveyard, and bank Treasure equal to its power to ramp into your big black payoffs. You'll grind value through removal, recursion, and forced sacrifice, then close with a fattened mana base and powerful black bombs or a combo finish.
Flash + menace make her hard to block and let you ambush combat or sandbag her as instant-speed value
Treasure generation can be explosive when opponents lose large creatures, ramping into expensive payoffs
Doubles as graveyard hate, denying reanimator and recursion decks key targets
Mono-black gives access to the best tutors, removal, and card draw, making her consistent
Cheap commander you can recast repeatedly thanks to Treasure-fueled mana
Her ETB is conditional—needs a creature to hit an opponent's graveyard from the battlefield that turn to do anything
Whiffs entirely against token armies, exile-based removal, and indestructible/zero-power creatures
Mono-black struggles with enchantments and resilient artifacts
No evasion-based damage scaling; she only deals 3 herself
Relies on opponents' boards or your own removal to trigger value, so she can sit idle