Even with her activated ability, Katilda may still leave you with excess mana
Not to mention, the rare Shadowless Holographic Charizard can shoot up to $50,000 or even more
Special Summon 1 "Dogmatika" monster or "Fallen of Albaz" from your hand
Card not found, on the other hand, was a stable in some of the most powerful decks of the time in Standard, meaning that it was miserable enough to be banned a year after its initial printing, which isnt even that notable, because there were so many bans around this time, because WotC had completely lost their grasp on Standard, which we are still feeling today
This makes a Poison Counter-based win a lot more reliable since you dont have to be consistently dealing damage