Madame Null, Power Broker is a rare Legendary Creature — Demon Advisor card from Teenage Mutant Ninja Turtles (TMT), collector number 265. Current market price: $1.41 (foil $1.83), TCGplayer market prices via Scryfall.
Deathtouch Whenever another creature you control enters, you may pay life equal to its power. If you do, put that many +1/+1 counters on it.