The War Doctor tracks each individual card that gets exiled or phased out, so effects like cascade can quickly rack up counters on The War Doctor, potentially even enough to take out an opponent in just one attack
Cultivate , Farseek , Kodama's Reach , Rampant Growth and any variety of dual lands and tri-lands are vital here, and Evolving Wilds and Terramorphic Expanse can seek out basic lands
With this, as long as you keep paying 3 life, it is possible to cast Mox Diamond from the graveyard as many times as you want
Many people considered it to be binder trash, but he realized the cards snipe attack just happened to be the perfect counter for the meta flooded with Greninja BREAK decks, allowing him to pick apart evolution lines and take easy Prizes
Of course, the elephant in the room when discussing this card is Underworld Breach
Making effective use of discard spells means sequencing and timing your strikes to leverage that information advantage