Without question, and as much as it sounds insane, the most powerful of all of The Doctors is The War DoctorThe War Doctor
The launch quickly gained traction, captivating players with its deep mechanics and rich lore
These all give you special effects such as drawing two hands at the start of your game or giving you effects when a creature with a specific name does combat damage
You already have Insidious Roots, but you could add Chalk Outline, Amzu, Swarm's Hunger, and Syr Konrad, the Grim, to name a few
There are also strong combo-style lines with Thornbite Staff, Ashnod's Altar, and Staff of Domination, and token loops around Krenko, Mob Boss that can spiral into game-ending damage
I remember being there in the crowd at the 2016 Pokmon TCG World Championships when Japanese player Shintaro Ito took first place with the card