Death and Taxes leans on Aether Vial, Stoneforge Mystic tutoring Equipment, and a steady stream of efficient white/black threats with Wasteland/Karakas disruption, so a fourth Disruptor Flute can name Aether Vial or Stoneforge Mystic to shut down their core engine's activated abilities. Endurance is a flash 3/4 reach body that blocks profitably against their aggressive creatures, and its enter trigger can clear their graveyard to blunt Overlord of the Balemurk's recursion. Grafdigger's Cage looks tempting against Overlord/Recruiter value, but both of those effects put cards into hand rather than onto the battlefield, which Cage doesn't stop, so it comes out. Pithing Needle is also redundant once you have four Flutes covering the same key names, and Maze of Ith is weaker since their threats are numerous and go wide rather than relying on one big attacker. Keep your full Wasteland/Karakas suite since both players fight over the same disruptive lands.