One life is just as in the game as 20, and when you have a third of your deck in your hand and the mana to pay for it, youre likely going to win that turn anyway
Cards like Ghostly Prison or Xyris, the Writhing Storm let you control the board state
Creatures whose "when this enters the battlefield" ability is worth repeating drawing cards (Mulldrifter, Cloudblazer), ramping (Solemn Simulacrum), removing threats (Reflector Mage, Skyclave Apparition), or recurring cards (Eternal Witness)
Horror creatures are usually themed as creatures so unreal, scary, and twisted that they deal mental damage
As time goes on you will have ground out a win as a result of the consistency, dedication to one purpose and redundancy of your deck